DIY led panel for microgrow

http://share.pho.to/3D0zM
Vent system is ready, After two hours of work:

in box:
temperature: 27,8 C (15 cm from LED panel)
humidity: 43 %

out:
temperature: 24,6 C
humidity: 50%

Looks good.

Do you have a link for what you attached the Leds too, is this a regular led Strip "pcb"?

I'm not sure about manufacturer, but my aluminum heatsink has same sizes http://canada.newark.com/h-s-marston/94dn-02500-a-200/heat-sink-0-6-c-w/dp/08WX9557
I don't now the type of strips, so take this photo http://i.imgur.com/EhAgiqS.jpg

the strip ur friend built for u? Could u ask him?

I dont quite get how it works, is this a special heat-transfering strip? How is the backside of the leds attached, i guess not soldered. Makes me wonder: how high do ur temperatures get there on the front and backside of ur fixture

Because if that works well it looks very interesting as u have ur leds nicely in line and dont need those star pcbs. On the other Hand, if the leds backside just has heat compound on it, the heat transfer away from the hottest spot might be quite bad

heat compound is between heatsink and strips, also diodes are only 1W - the temperature is so low, you can comfortably hold heatsink and diodes
If I'll be required in less temperature, I can attach 2 fans 40x40mm to blow through heatsink ribs.

ah ok only 1w... in the beginning u wrote 50x 2W aka 3W diodes. common opinion here is that 1watters suck.

http://share.pho.to/3EI5l
Added fan screens to protect leaves