Search results for query: light compensation point

Thanks Darrel, Also could I add a little bit more ferts than I usually would before I go say double dose and would that have any negative effects??

Hi all, I wouldn't, just because that runs the risk of falling below Light Compensation Point (LCP) - <"Light Compensation Point and optimal PAR levels">. Same for me, basically "if it ain't broke, don't fix it". I'm pretty sure any cure is likely to be worse than doing nothing. cheers Darrel

...think you have to leave them. The problem is that the algae growth is much, much quicker than the rate at which Anubias barteri produces new leaves. If you shade the plant the algae won't reach <"light compensation point"> (LCP), but the Anubias still will and the algae may be shed. cheers...

Here's a closeup of A.Pedicatella adjusting to a lot less light than its neighbours by staying very green...

...eleven plants">, which need plenty of everything. We have <"had some discussion"> about which plants may have the lowest Light Compensation Point (LCP) <"Name some SUPER low light plants">. I think that is relevant as well, survival "cool and dark" will be much better than it would be...

The light compensation point varies among plants (the LCP is where photosynthesis equals respiration, below the LCP the plants will eventually die and with too much light the plants will not thrive either and becomes algae magnets). We don't seem to have a whole lot of specifics for the various...

...always suggest people run with their <"light at full brightness">, it does away with the variable of not / only just reaching light compensation point (LCP). * Calibrating the Leaf Color Chart for Nitrogen Management in Different Genotypes of Rice and Wheat in a Systems Perspective cheers...

@_Maq_ , @dw1305, @Tim Harrison, @Witcher, First of, thanks for the help. So I have remove maybe half of the floating plant now and I did cut all the affected leaves ( which i do regularly anyway). But I'm sorry to say that I'm seriously skeptical that it's gonna stop the problem. It's gonna...

...not enough light hitting the plants below. It may actually be the cause of the algae problem. Plants have what is known as light compensation point. Below this they can’t photosynthesise properly and start to die and decay and release organics which will feed algae. Another knock on effect...

I can't comment on the saturation point but can say that light compensation point of some Hygrophila sp is fairly low. Here we have Corymbosa "siamensis" with about 18 ~ 20 par at substrate, or in layman's terms 1 14.5w led in a 1200mm tank .

...and braces"> in terms of nitrification, particularly if you <"have a dead fish"> etc. You need to ensure the plants have a enough light to reach <"light compensation point">, if you are sure that lower light will accomplish this? Lower the light intensity, if you aren't? Don't. cheers Darrel

...consider the lean tank high light but its definitely not low... (not very helpful I guess :) ). Trying to manage the Light Compensation Point (LCP) - which I admittedly don't truly understand - is something that would take a lot of trial and error for individual species I think. Cheers...

The first question to ask is whether the plants are already adapted to aquatic conditions or not. Makes a big difference. If plants are already adapted you can pretty much neglect a start-up phase. The act of transfer is disruptive for sure, but I find plants to catch up really fast. Unlike...

...is running on <"petrol fumes">, that is , enough photosynthetically active / usable radiation (P A /U R) to get above <"light compensation point (LCP)">, all nutrients present, but in very small amount, and <"access to atmospheric"> (<"~415 ppm">) CO2, It forms a perfect small plant...

Everything’s slower…. What’s the point🤣 Lean column…. Less co2 demand great forms… brilliant colour, what more do could you ask for.

...Why not run ADA system or rich substrate, lean column, proper co2 with your light at 30%. EDIT: When we know that the light compensation point is pretty low. So why should we not EI the light? I get that relative to my 4 lights, my system in the past was at "30%" of now ... but why reduce...

No net photosynthesis is technically the same as no photosynthesis, no sugar accumulation, and no net oxygen production. The OP thread asked when is the best photo period for optimal photosynthesis. If ambient light starts the circadian clock, then any night time photo period is a waste...

No, it doesn't work like that.. Below the light compensation point respiration exceeds photosynthesis. It is not the point of no photosynthesis. Anyways the wonderful "complication" https://www.eurekalert.org/news-releases/595249 https://www.science.org/doi/10.1126/sciadv.abi8307 Respiration...

Photosynthesis will not be activated by ambient light if it does not exceed the plant light compensation point. Indoor ambient light is typically below LCP and this is why artificial light is needed to grow aquarium plants. So aquarium plant circadian clock is artificial, not measurable by...

Hi all, Welcome to UKAPS. There are lots of <"scientific references"> available via "Google Scholar", this one would be a good starting point (and should be open access?): "Sand-Jensen, K., Riis, T., & Martinsen, K. T. (2022). <"Photosynthesis, growth, and distribution of plants in lowland...

All good ideas! I admit, I didn't think about the HDR option but I did use some Exposure compensation (+2 Points). Unfortunately, I don't have the external flash or the skills to use them but I definitely want to explore that and external lighting at some point. :) I have never had a low-tech...

...I think both @Hufsa & @plantnoobdude are right and potentially they do, but only if we assume <"that PAR"> is above <"light compensation point">. In most, fully submerged, aquatic plants <"Total / Dissolved Inorganic Carbon" (T/DIC)"> will be <"Liebig's limiting nutrient">. This is...

...I'd suggest doing this but if there is only 10 par at the substrate then this will be getting pretty close to the plants light compensation point, in layman's terms the amount of light they need to actively grow. If you did follow this route I'd only increase the light a bit, say upto 20%...

Day 189: Fighting the thread algae. Today turned down the lights to 4 of 10. This is my light compensation point, so I will have to check that the plants are still growing during the week. Lucky that the HYDROCOTYLE LEUCOCEPHALA grows so quickly. I am going to make yet another acrylic tool to...

...any further, back Fluval is running at 10% and front is running at 15%. I am quite certain I am already hovering right above light compensation point and if I go any lower than these percentages plant growth starts stalling completely and the plants get unhappy. I havent gotten particularly...

I stopped dosing seachem ferts and I am dosing 0.2ml of tropica specialized nutrition daily (I have about 30L of water). The stats for the new light can be found here, it's the 49W one. http://www.chihiros.cn/en/productd/m2/id416.html

...of light, not so much that your plants run out of the very little CO2 they have access to (~2-3 ppm), but not below their light compensation point. Are there available PAR ratings for your light? Have you increased your fert dose any since you posted? For beginners, I would suggest dosing...

Hi all, Yes, <"Light Compensation Point">. It is a really useful concept, but we don't have actual LCP values for the plants we grow. We can make some educated guesses, plants with <"slow growth rates and dark green leaves"> (most Mosses, Anubias barteri, Bolbitis heudelotii) are likely to...

Lcp: Light Compensation Point ~ that's the name regarding plants stopping growing. If the Gh and Ph are drifting northwards and you feel you need to reset things I think the best advice would be to do the water change. I re set my tank over Christmas with 2x 50% changes over a few days. Your...

10 pts to josh, it's a good assumption, the evidence of poor distribution was always the give away. Goes back to your thread that everybody is right. On this point I have experience, I ran these tanks at 50% less light for 8 months and still had healthy plants, they NEVER reached lcp, I'd...

...note: cut your lights further and you will fix the algae but you will be growing under darkness — you may struggle to hit LIght compensation point of plants but who cares about that - you will be decreasing the rate of photosynthesis and necessarily oxygen evolution to the system - cut the...

...have stable CO2 injection and with long Sunset and Sunrise(do now know what intensity those are may not meet plants minimum light compensation point so they are not doing any photosynthesis/growing during that time )setting complimented with 4 h at 100% is where your troubles are. Algae has...

...is that we are really bad at judging light intensity and <"Photosynthetically Active Radiation (PAR)">. To make sure that we haven't lowered light intensity below Light Compensation Point (LCP), I always use a relatively bright light and then just <"use the plant mass to adjust it">. cheers...

Thanks for the reply, the links were helpful. And I guess the algae I have mostly is BBA which is CO2 related not light related it’s fair to say? So upping the seems my next course of action after this week. Having started EI dosing now

...the light to full intensity and run it for at least eight hours. Yes, you are right, you need light intensity to exceed <"light compensation point (LCP)">. We don't have LCP values for the plants we grow, but for some plants light always needs to be <"turned up to eleven">. It certainly is...

...to say... Without a PAR meter all you can say you have light. All plants have regarding their genetic preference a different Light Compensation Point and accordingly more or less CO² preferences. And this divides the plants into 3 groups, easy, medium and advanced to grow. Obviously, the...

Hi all, You can definitely use a dim light for tank viewing without getting anywhere near light compensation point (LCP) for any photosynthetic organism, plant or algae. Our eyes are really good at adjusting to low light levels and <"subdued room lighting is only 100 to 200 lux">. cheers Darrel

Very difficult to draw parallels with corals because other than the basic processes the mechanisms are different. Whereas direct chloroplast interaction occurs in freshwater plants the corals are interacting via symbiosis with zooplankton intermediaries. Plants have direct interactions via their...

...so just food for thought. As to my own opinion, I' m not convinced either way as long as one is not pushing much past the light compensation point like 50 par for 12 hours vs 75 for 8 hours. 200 par for 3 hours might be an issue though exact effects are ??? Carotenoids and peroxides ...

Watts can be a rough indicator of lumens based on most LEDs (and actually most other light sources i.e tubes metal halide) They have an efficiency of about 70-100L/watt. Old style 3 watt-ers were around 40-60 though. Yes lumens are err "antiquated" in this day and age. Does help to at least...

...news. Or these modern led's put out far more par values than the wattage would once of a day suggest there capable of. The light compensation point of aquatic plants is far below what was previously assumed. Or I've somehow got lucky and managed to defy the laws of physics with my lights.

Hi all, You are almost certainly right. I think I'm probably reasonably good at judging light in the flesh, but I haven't actually seen a lot of these lights, so it is mainly guesswork. cheers Darrel

Thanks for the info - I will take a look at the other thread. Certainly open to a spray bar, so happy to try that. Plant movement looks good along the back wall, but everything is fairly still upfront.

...you could give it a read and see if any of it applies to you as well? I understand @dw1305 concern about dipping below Light Compensation Point, but I believe a shift in mentality may be needed, as modern LEDs have gotten almost ridiculously powerful and I have seen quite a lot of posts on...

...down all the way until I saw the plants begin to struggle, which means they werent getting enough light to meet their LCP (light compensation point). Algae growth had almost disappeared at this light level but plant growth was very slow. From there I gradually turned the light back up again a...

Hi Darrel thanks for your reply. I reduced the lighting on John's recommendation, however, I'm happy to adjust it again. Pics attached (the plants looks more yellow/brown irl - the camera isn't quite picking that up). It's worth mentioning that I'm dosing TNC based on the Rotala Butterfly...

...<"the leaf colour">. Not my advice as such, <"I like plenty of light">, because that way we've ensured that we've reached Light Compensation Point (LCP) and taken <"lack of light" out of the equation">. I'm not sure, it might be the <"assembly line"> nature of plant nutrition. Hopefully a...

Wasn't an intruder. It was likely an algae. My thoughts: The issue: too much CO2. Why? CO2 isn't about CO2. CO2 is about pH and enzymatic/microbiological function. HC has a higher metabolic demand than an "easier" counterpart ... say Monte Carlo. As a result, it requires more sugar to be made...

I'm not sure really, it's weird that it doesn't look more green but it could well be growing from potential nutrients in the tapwater, or maybe unconsumed nutrients left from the fish mix? I've never had a bacterial bloom in a moina or daphnia culture really, not of free floating bacteria anyway...

Thank you. Makes sense, if I'm still dosing but only having the light on low, doesn't sound right does it lol! Logical really but didn't think of that before.

Yeah it make I believe it is 50cm deep . Ill try increasing it and do smaller more frequent water changes. Plants can't really look any worse haha. I do get plant growth as recently done a trim but its slow given the current light. Think I might stop using the tropica and perhaps order some tnc...

...PAR output. When you are adding nutrients and CO2 your plants can't make use of them if the light intensity doesn't reach <"Light Compensation Point (LCP)">. You can leave your present lighting period (it is always a good idea to only change one thing at a time), but I also don't like a...

...to grow stems at the rear of the tank. Even when I eventually got it up to 100% after a few months, it wasn't enough really for the stems at the rear. I know increasing the light is not typical advice, but I wonder if 15% might be below the light compensation point for some of the plants you...

...conditions, if you think of Ivy (Hedera helix) on a woodland floor, it might have weeks in the winter when they don't reach light compensation point (LCP) and you could have even darker conditions on the arctic tundra, or under a snow bank, where low light levels might extend for more than...

Algae has a much lower compensation point of light than plants, so extended periods of low light can contribute to algae, so if algae levels become unacceptable cutting back on these low light 'viewing' periods is often is a good starting place, some scapers have their tanks in dark...

After a cursory look at some circadian info the simple answer would be to maintain a 24 hr period. 8 on 16 off ect not like 6 on 6 off and repeat Not sure how it would effect things since not all species behave the same way circadian wise. Circadian rhythms kind of change the concept of waking...

...several orders of magnitude of light intensity. If the light looks dimmer you probably aren't getting anywhere near the <"Light Compensation Point for photosynthesis"> for any of the plants. Even if you have some daylight at the moment (I don't know how far N. you live) it will be...

Great info everyone thanks for the input Is there a general figure at which point the majority of plants will ‘wake’? Like a certain number of lumens

The recommended 6 to 8 hours cycle is more aimed towards the best period to prevent algae but still sufficiently grow plants. It's a sort of better safe than sorry, lazy men's concept without guarantees... It's a good schedule for a start since most plants need to transition to aquatic form and...

I was thinking in terms of the other plants not the frogbit.... so if the frogbit is ok, but the plants arnt, it suggests either light/CO2 as the possible cause..? Thanks, i'll have a read through the links tonight. Only thing putting me off the complete version is that with fish in the tank...

...plant has "first dibs" on the light. I like to run the lighting at <"full intensity"> initially, it takes not reaching <"light compensation point (LCP)"> out of the equation. After that it is all really down to staying in the <"Goldilocks zone">. I'd buy a more <"complete fertiliser">...

...radiation"> (PAR) to allow for plant growth. Each plant species (and each leaf on each plant) will have a different <"light compensation point (LCP)">. Because of all of these variables I take another approach, I use a longer photoperiod, and if I have a brighter light source I use a...

...go any shorter than five hours in the main block. You need to make sure that your plants <"have sufficient light"> (above light compensation point (LCP)). I've never kept a high tech. tank and I understand about carbon limitation, but I don't understand how 19 hours below LCP can improve...

Right, what I'm taking from this is: Anubias has to come out and be replaced If I'm managing to grow algae that's a good thing

...all, <"It is">. I don't know how bright this is, but I'd approach this from a different angle. If your plants don't reach <"light compensation point"> they aren't going to grow, but will decline. I use whatever light I have to hand, if it is <"bright light"> I just have more floating plants...

...able to provide a better answer than myself. I would off said low intensity makes like to no difference esp if its below the light compensation point for the plant, but I would also be guessing at the same time. Some scapers do there tanks in cellars with no ambient light so gaining full...

Anubias leaves have been removed but without much persuasion. They kind of mushy. Should I go the other way and add some liquid carbon and up the lighting maybe? It's not awful yet so maybe it will be ok to wait a while and see if a snail or something will sort it once the tank cycles.

Hi all, I don't think that will help. Six hours is already a short photo-period and if the light intensity doesn't reach light compensation point plant health will decline further while the light is off. I'd stop removing any of the green plant mass, you need the plants to put some growth on...

...- but we are forced to use light to grow plants (as all plants require a minimum amount of light referred to as the LCP (Light compensation point). But if we have an amount of light and not enough CO2 for the plants to utilize it (and not enough OTHER ferts for the plants to utilize it), then...

Good point!... :) never really crossed my mind that it's something natural too... The ferns and or mosses, whatever low compensation point plants that grow on the forest floor below the canopy actually receive a kind of pulsating light intensity due to air movement through the dense canopy. (Now...

...with plants, grows BBA. Now i have much more Anubias growing and spreading and fewer algae-covered surfaces than 3 years back. :) What catches my eye is the places to dark for Anubias to spread to naturally does have BBA. Could mean, BBA has a much lower light compensation point then Anubias.

Hi all, It depends on the plant. Mosses, and plants like Bolbitis and Anubias, will have the lowest <"light compensation points (LCP)">. There aren't experimentally defined values for the plants we grow, but if a plant is <"dark green and slow growing"> it is likely to have a low LCP. cheers...

Well algae has a lower compensation point for light that plants, so they can use light at lower levels than plants and thrive on it. The best level of light to prevent algae is no light. But also nice to enjoy the tank at low light levels too, so I would beep an eye on it. I do have a system on...

I had not even considered that a plant would fail in a setup -- interesting. But those plants that get shaded, do they continue to grow properly or do they eventually not make the compensation point and end up dying? I have no experience on shading plants because my other plants grow so well...

I am going to make a few posts to address things 1 at a time: 1) this one for the McCree curve -- really neat findings. 2) Comment on progress on tank 3) Respond to posts First, I have attempted to cite everything - I didn't go formal (APA,IEEE, etc) but I do want to give credit where credit is...

Dont forget some plants will just fail in your setup no matter what you do, Darrel uses the three strikes and your out, I tend to give them less chances unless I really like the plant Every time the light goes off ;) or when a plant gets shaded by other growing plants so all the time esp after...

@Zeus. Thanks. I'll have to think about this -- I can say Buce, Anubias, java fern, (lower compensation point), and these are epiphythes so I can see the roots etc. Crypts too. I suppose root growth is also growing? I cannot say that pogo is growing because it is just slowly dying off...

But the Erectus offers more resistance to flow with many fine leaves, also different plants 'may' tolerate different fluctuations in CO2 Are your plants growing ? if they are then they are non light deficient If you plants are growing but have issues then they are deficient in a nutrient...

Not really, it's too dim. I doubt it's even anywhere near the light compensation point, for instance. The goldfish Carassius auratus has tetrachromatic color vision it can see in the red, green, blue, and UV regions of the spectrum.

...it fully without enough submersed form foilage. Than you will most likely fovar algae growth.. Algae also has a much lower light compensation point than plants do. Thus in lower light conditions plants are almost at a stand still when algae is still growing. You would likely be beter of in...

Thanks Darrel interesting read ...I was under the impression if leaving lights on while away on timer, would mean I would need to “keep”adding the l/co2 and l/ferts..as said only want my friend feeding when I’m away and topping up the tank.. Thanks again... Oscar

...your present six hours). The reason is that you need the <"photosynthetically active radiation"> (PAR) level to be above <"light compensation point (LCP)"> for the plants to grow, and you really want the plants growing. Plants are just <"the gift that keeps giving">. I look upon <"actively...

https://www.diatoms.de/en/culturing/light :) Interesting read, it seems in general Diatoms thrive on the blue and some even on the green spectrum of light. This is why diatoms can be found in rather deep waters where only blue still penetrates and red and green are filtered out. Thus a diatom...

I was considering buying a tank from these until a read their feedback on eBay... I soon changed my mind!!!.. glad to hear you’re finally sorted though, can’t wait to see the end result!! Sent from my iPhone using Tapatalk

Ok... well... where to begin.... So much has happened since my last post and there is a lot of ground to cover. I have a feeling this update will be slightly abbreviated and cover a lot of the negatives in spending close to £3000 with 'a company'. My head has gone through "woooo!! Ive ordered...

..."algae" (the plants you don't want) and "aquarium plants" (the plants you do want), then all plants need to reach their <"light compensation point"> (LCP) before they can grow. Some plants need everything <"turned up to 11">, other will have a much lower LCP. We don't know what the LCP is...

...because any small amount of them the plant gets, it can utilize eventually. Where with light, there is such a thing as light compensation point, below which the plant just won't grow. As for the floaters, I was never able to grow them in a tank that also has emersed growth. They just...

Hi all, Do you have the lights on at all? If you don’t? You need to have them on for a short photoperiod every day. Plants can only photosynthesise when light intensity exceeds “<light compensation point”>. When they don’t get high enough energy light they just slowly decline. Cheers Darrel

Hello buddy, put simply...in broad terms. From what I understand reading the link on LCP, if I have this right that is :shy: Essentially plants sleep like we do so when they're sleeping in the dark they breath out co2 and consume oxygen. They get woke up by light and when there is enough of it...

Hi all, I'd reduce the photo-period. Plants can only make use of light when its intensity exceeds the <"light compensation point">, the problem is that LCP isn't something we can easily measure. Personally, as your adding CO2, I'd go for at least a six hour light period and start ramping the...

I installed a dimmer/controller and after reading about Plants Compensation Point a light lit up. And since i ran tanks up to 18 hour light periode. With 10 hours at full 100% and the others bellow compensation point. Now 18 hours might be a tad much, bt seeing my pond setup in the garden do it...

Awsome monster project!! Realy nicely done... In the last video you mention the fish freaking out when lights come on!? I assume all comes on at the same time? If you would controll it not to do that but in stages, you will not freak out the fish but also can create a bit more natural...

Most professional green houses are completely automated with climat control and kept at a constant 80% humidity with around 15°C to 25°C night and day temperatur through out the year. During the summer periode when it's extremely hot outdoors temps will obviously rise in the greenhouse. Air...

Got back off Holiday this morning so been two weeks since the tanks filters have been cleaned did a fast 50% WC day before I went on 10day break, decided on no change for Ferts Lights etc and do a Big WC tonight first night back. Then BIG clean up WC at weekend. Plenty of GDA on Glass so pics...

Hi Marcel, The references you list are more focused toward CO2 Compensation Point as opposed to LCP, but it demonstrates the fact that one cannot easily discuss light without also discussing CO2. That is specifically because the energy derived from light is used to remove the Carbon...

...When the value of the sugar produce by the incident light is equal to the value of the sugar being burned by the plant in order to feed it's cells then that light intensity is called Light Compensation Point (LCP). LCP for typical aquatic plants are at a PAR of about 10-20 micromoles. Cheers,

Search the forum for "light compensation point", especially posts by CEG4048 for discussion of minimum light levels necessary for plants to start photosynthesising. It actually quite high, as seen by the human eye, before even "low light" plants start synthesising.

Hi all, Pretty much, for conductivity you can just dip the meter in and get an accurate reading, you don't need to calibrate the meter every time you use it, it has automatic temperature compensation and you don't need to construct a standard curve, or perform serial dilution, but for...

I use a programmable LED. The light is on for around 14hrs a day, but outside the 6hr photoperiod it's only on very low light, high enough to enjoy the aquascape but low enough not to induce photosynthesis. You have answered your own questions, but to clarify - Aquascaping is just like...

I believe you that majority show class planted tanks get only 6 to 8 hour photo period. But how do you enjoy your tanks in darkness most of the day or you want to show off to visitors. Do you turn the light on momentarily and off again after viewing or else risk algae pop up left and right...