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Hi Darrel I have seen this 1/distance^2 explaination many times in the hobby. The above diagram is true and valid for a point source only. In our tanks we all have tubes or led panels, never point sources. As a physicst I know that for such cases the intensity falls as 1/distance, i.e inverse...

Hi you dont need to measure PAR, only that sunlight is way stronger than tubes. So I would suggest you start with CO2 way early so that theres enough in the tank by 8:00 am.

Hi your observation is true, plants dont have preferences of one source over other. Whichever light is shone, they move to start the photosynthesis. Guess its the energy trigger that causes this. If it gets too bright, you might want to shade/cover the tank glass. BGA on the front substrate...

Thanks! I just needed reassurance from someone responsible. :happy:

Hi Paulo I dont need "extra" lights, just want to change to open top as frequent trimming would be easier & more accessible.. Dont have money to replace Juwel by ADA style "nicer" tank at the moment. Any suggestions for which would be a good combination/brand for doing this?

Hi All whats the best way to replace Juwel tank closed light hood with a better stand alone lighting stand? I have a 180 litre tank and would like to get a better lighting system (height and intensity controllable). Any and every suggestions are welcome... cheers

Looking at the graphs above, the lights dont seem to degrade much. I have T5 running 4+ years now without any noticable decrease in my plant growth. I know this because I count time needed for a stem to grow. Its rough estimate, but works. I have full EI, CO2 dosing, and about 9 hrs lights ON...

Hi the idea is that the plants should have adequate ferts & co2 available to them when the lights are switched ON. So that the plant can start doing photosynthesis without having to worry about any missing ingredients that stall the process & invite algae. Hence put your ferts at the begining...

hi what ceg is asking is to replace easy carbo with a dedicated CO2 system (diy or cylinder) as with this lighting, plants are bound to suffer from Carbon deprivation. Easycarbo is good/economical for smaller tanks with much less lighting. Else algae pester you.. So you could continue with EC...

Anyone?

Hi there I have a question re lighting.. Known known: If one is unlimited in ferts & CO2, controlling light is the best way to avoid algae & get a healthy plant growth. So if one stays in the low/mid WPG light limits, but gets fluctuations in lighting (mostly the ON period -- my 3 year old...

Another thing to note is that water acts as lens. Particularly water bodies with moving surfaces (aquariums, swimming pools, shallow streams, etc). There, caustics are formed due to the small waves which act as temporary miniature lenses, continuously focusing & de-focusing light from above. In...

Well as per the latest info, only a chosen few have been pre-selected based on the ancient Andromedian ritual in the supra-council meeting on the Comet Hale Bopp. Matrix hasnt responded on my receiving frequencies, so guess I am out & cannot be retrieved on the ex-D-day :( So I will simply...

Hi Clive there is something to think and digest what you have said. Will try during office hours :) The adaptability of plants you mention, wont it take at least a few "generations" for them to do so properly, like a Darwinian scenario?? Are individual plant saplings we plant in the tank soo...

Hi Clive in light of your above statements, would it be accurate to think that plants need an optimal total amount of light above their LCP per day (think of number of light quanta of appropriate frequency, per unit area/amount of photosynthetically active leaf mass, per day)? Then the main...

Hi guess the difference comes because T5 in comparison to T8 will, at the same electric wattage, produce more light photons (efficient) and being a narrower tube diameter means it will put higher intensity light all the way till the bottom of the tank. Moreover the scalings are non-linear. i.e...