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TC420/421

Hi,

I am looking to use one of these with a Chihiros 1201 Plus RGB light. The light has three colour channels which can be individually programmed with the Commander 4 Bluetooth module. This works, however it is a pain to use and doesn't always save the settings correctly, which is very frustrating after having spent ages creating a constantly varying light spectrum across a replicated day (this takes a long time with the cumbersome app).

So, this is why I want to try the TC420. The light comes with a piece of cable to blank the Commander 4 and just run all channels at full power when it is on. It has 6 different prongs on one end, so I would just cut this and wire up each channel individually, similar to how its been suggested to cut the dimmer switch for the single channel Chihiros lights earlier in this thread. Ignoring my desire to control each colour separately for a minute, this is also necessary because the light draws 95W with all channels at 100%, which would exceed the 4amp limit of the TC420 and so would have to happen anyway for this light.

My question though is that in the comments on a video I saw on youtube on the TC420 (This one: ), the producer states that the red channel may need to be run at 2.2 volts and so a voltage regulator would need to be connected in-line.

Can anyone confirm if this would be the case and would advise I install such a regulator?

I assume the power supply provides each channel with the same voltage, and so would the light not already have a regulator in-line somewhere else, and therefore I don't need to correct it myself?

Or, is this just another made up statement on the internet and all channels are run at the same voltage?

Thanks in advance!
 
Best option for you is to actually measure the voltage and perhaps current coming out of the commander when it's working. Otherwise it would be difficult to guess unless if you have the the circuit diagrams for this light.

Chihiros plus RGB doesn't come cheap and you don't want to damage it!
 
Hi folks,

Was wondering if the tc421 can run both 12v and 24v lights on different channels at the same time?

Assuming the driver has enough wattage to cover.

E.g.

Ch 1: 1 x10w @12v
Ch 2: 1x10w@12v
Ch 3: 1 x 3w@12v
Ch 4: 1x28w@24v
Ch 5: 1 x 28w@24v

Powered by a 90w driver?

My grasp of electrics/electronics/physics is poor so would much appreciate some help.

My suspicion is I'd need 2 tc420/21s with 2 drivers (1 x24v and 1x12v).

Thanking you.


For example run
 
Hi folks,

Was wondering if the tc421 can run both 12v and 24v lights on different channels at the same time?

Assuming the driver has enough wattage to cover.

E.g.

Ch 1: 1 x10w @12v
Ch 2: 1x10w@12v
Ch 3: 1 x 3w@12v
Ch 4: 1x28w@24v
Ch 5: 1 x 28w@24v

Powered by a 90w driver?

My grasp of electrics/electronics/physics is poor so would much appreciate some help.

My suspicion is I'd need 2 tc420/21s with 2 drivers (1 x24v and 1x12v).

Thanking you.


For example run
Your suspicions are correct.
You would need 2 , one to match each of the constant voltage string designed parameters.
 
Was wondering if the tc421 can run both 12v and 24v lights on different channels at the same time?

This one is it

As far as i know, no.

If you hook it up with a 24v its 24v.
Same with 12v.

The TC isn't a driver but a controller for a constant voltage LED. When you connect a constant 12-volt PSU to the TC the output will be constant 12 volts.
This means a 12-volt input connected to a 24-volt LED at the output will still run but will be dimmed at 50% of its capacity.

The TC doesnt discriminate it puts out what you put in... Vice versa if you put in 24 volts and have 12 volts LED at the output they will burn out.
 
Was wondering if the tc421 can run both 12v and 24v lights on different channels at the same time?
Well, technically you can do it with a workaround if you are using LED strips but there are a couple of caveats. The power supply needs to be 24v, it doesn't work the other way round. Basically for each of the 12v channels you need to hook up 2 strips with the exact same power draw in series, such that the 24v is shared equally between them. This link goes into more detail: Using a 12V LED Strip in a 24V System. Note they add a disclaimer:

Bottom Line

In theory, connecting two identical 12V LED strip segments in series can be a solution for pairing with a 24V power supply. In practice, however, it can be somewhat risky and we recommend going down this path only if you're in a pinch!
12v24v.JPG
 
Powered by a 90w driver?

This is a tad confusing... 🙂

What do we have here?

We have a constant voltage 90-watt PSU giving 12 or 24 volts.

Or do we have a 90-watt constant "current" driver in Ampere?

The LED driver is about constant current and a PSU is about a voltage x Watts.
 
Last edited:
Thank you all for your wisdom. Currently only running 2 x 10w lights on a 20w power brick (psu?) which is working fine but been thinking of getting a new set up and hoped I could simply add it to what I've got.

Thanks again folks, a separate controller or finding alternative lights that are 12v seems to be the way to use all the channels (and a bigger psu to handle the total wattage output).
 
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