Could someone please tell me more about these? I know you can daisychain them, and they are little squares with one light a piece. What is a good price? Are they any good? please help.

We need more info.
post what unit you are looking at.

Bing a engineer I have made my own and the two lights I bought from petsmart
that are marineland LED have a moon/night light included.

in actuality in theses lights the blue LEDS are on all the time and when you switch to night/moon mode the white LEDS go off.
and that mode was a bit bright so I just put electrical tape over the LEDs and made a small hole to let the amount of light I wanted out.

I am in the process of making my own lighting system that will mimic the light conditions of the environment that are native to.
it might seem a bit overboard but I want happy fish.

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This is the closest I could come. I don't know exactly what they are called but I saw them on my neighbors tank and they looked nice.

no you can not daisy chain them.
they have a small power supply that can only run one unit at a time.
unless you get a larger power supply but that might void the warranty.

but there is nothing to stop you from having more than one unit.
you will just have to use a plug strip for the power supplies and plug the plugstrip into a timer.

ok thanks