Hi everybody! My name is Alessio and I'm from Italy.
I read a lot about this, but I still need your help because I really want to make my own LED fixture, so I'll appreciate every help you can give me.
I have a new tank, it's about 43x19x19 inches (110x50x50 cm) and I want to set it up as an hi-tech tank, that allows me to keep every kind of plant I want; that's what I'm thinking about:
a big finned heatsink, 30"x12" (90x30 cm), 1.6" thick (4 cm), with some Cree XM-L leds (I can change the measures of the heatsink if you think it's better, that's just what I was planning), I would like it to be passive cooled..
The led spacing would be 4" and each of the 3 row is 4" from another too; yellow dots are Warm White leds, and white dots are Cool White.
Each row would be driven at 1750mA separately, no dimming for now, maybe in the future.. I was considering not to use optics/lenses since they're considerably hard for me to find, so I should keep the leds really close to the water surface (4-5"), so about 20" from the substrate.
What do you think? Too much light? Too low? Impossible to do it without lenses?
Sorry for my english and for the bad scheme..
REALLY THANKS IN ADVANCE!!
a couple of things.. 1750mA driver????
also if it was me, I'd stick one type of white per channel..
you can "control" the color temp..
Use LDD PWM dimming drivers and buy a $50 Typhon from StevesLEDs..
The 10 WW are not a problem.. 17 whites are a bit of an issue..
Using a 48V seperate power supply and Ldd's @ $7 each, I'd look at splitting into at least 3 channels..Adding a channel costs about $7 US (one driver)
Use 1000mA driver.. Better W/lm ratio...and easier to cool..
Assume 3.4V per LED (really more like 3.0 @1000mA) in series and 3V "loss" w/ a Meanwell LDD..
48V PS usually can be "tweaked" to about 51V..
Limit yourself to 13LED's/per channel..IF using 3 you can squeeze in 15/channel (1000mA drive current)
I assume you have some driver in mind.. which is it?
Oh as to dimming.. Best to "plan ahead".. since driver swapping is poor economics..
no optics, low to tank is fine, scheme fine,
Slight mod for channel balance but it would be dependent if you plan to dim.. The overall tone may be a bit "warm" (straight on full) but that is user preference .. or not.
12WW:14 cool white
Using 6500K and 3500K LEDs