I want to do a DIY LED fixture...I've bought 50 3w LEDs (700mA and 3.5 Vf) and 55 star heat sinks...I already have an Arduino Uno that I am not using for anything (maybe out will work, haven't looked seriously into it yet) and 3 30mm computer fans
So basically I want to design a lighting fixture that is adjustable in 1% increments that I can control to be on 24/7...and have a 2-3 hour sunrise sunset cycle...and turn down really low to double as a moonlight at night
Am I understanding it right that I will need a 150w driver at 700 mA constant current supply?
first off consider a Typhon... or a Corallux controller.. unless you want to go the "uno" path. Basically both the above are built on adruno chassis..
The Typhon has a bit cruder "steps" than the Corallux (at least in theory) but it is reprogrammable.. and all the pieces are there (except serial port to PC interface card)
W/ the Typhon you would have 3 "daylight" channels" and one "moonlight".
$7 CC Meanwell Ldd-h's to go w/ each channel and a PS to match.
So minimum 2 drivers..
Your ps will depend on string length. common 36V PS will allow you to run 9 LED's per string.
Meanwells LDD-H will subtract 3V from the PS so keep that in mind.
your max LED count would be 36 (ignoring using parallel strings at this point) .. though running 9 for moonlight is not really necessary.
Just to touch on the parallel/serial thing.. Using 1000mA Meanwell driver and running the LED's at 500mA you could do 2 series strings in parallel.. increasing your LED density (but decreasing inv. output but NOT by 1/2) by a factor of 2..
Voltage stays the same.. amps are halved between branches..
look up series/parallel led architecture though..
7/per string.. 2 strings paralleled and 3 daylight branches would use your LEd count (42 plus moonlights).. IF you really wanted to..