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IMHO, it would be better to use 2 pieces, each, 30" long of the 4.23" profile (9892 cm2) with the cobs at the corners of a 16" x 24" rectangle. A couple of pieces of angle aluminum could tie the two heat sinks together and provide a mounting spot for the driver in the center of the "fixture".

The 4.6" or the 5.375" profile will do just fine! Assuming you get cd bin leds 200W x .44= 88 heat watts, 110 cm2/w for passive means you need an area greater than 9860 cm2. 9860/32" means the profile needs more than 302.5 cm2/". The 4.6" serated profile @342.88 cm2/" works but the base plate...

I have pretty well settled on a lamp module to cover a 2'x2' grow. Basically 4 CXB3070s @3000K BB or better bin, mounted on 2ea 23" pieces of the HSAmerica 5.88" profile powered by an HLG-185H C1400B. Since I'm going to use the same fixture for both veg and flower, I'm considering adding some...

These are NOT dimmable! for dimmable the model is LCA**** Price comparison with the dimmable Meanwell is hardly appropriate!

First off: The CXB3070 is high bin, (BD) and the CXB3590 is high bin (CD). The lower bins of CREE are about as bad as the Veros You would need to really be in a high $ cost power area!!! If we dim the CXB3590 (CD bin) panel to produce the exact same amount of light as the CXB3070 (BD bin)...

If I'm going to "abandon" the Veros for CRE due to efficiency, the CXB3590 CD bin isn't the only choice, though it appears to be the most efficient. Perhaps The CXB 3070 BD bin is more price friendly & still offers great efficiency ( 54+%).

Switching to CXB3590 does save half the drivers as the HGL-185-C1400 can power 4. Does anyone stock these?

Well I'm glad I haven't ordered any parts yet because I'm not pleased with the efficiency and PAR output, mainly because of the Vero 18s. I'm now thinking of 16 Vero 29's instead of 24 Vero 18s to cover a 4 foot square. I'll still build 4 " fixtures" but each will cover a 2' x 2' square...

I found Supra's posts on actual testing and at 115CM2/W he had a 9C rise above ambient while at 90CM2/W he had 11C rise. I can switch to the 4.85 profile ($28.42) which would be 106CM2/W rather than the 124.8CM2/W that the 4.9 ($51.62) gives and still be under 10 degree C rise. But I'll stick...

From searching on this site I've learned: Passive cooled designs with a heat sink area of 110 CM2/W(thermal) will run at about a 10 degree C rise above ambient. The Vero 18 at test current dissipates about 60% of the energy supplied, stated another way is 40% efficient. A 29" length (chosen...

After some more browsing the WWW I found: http://www.led-heatsink.com/ModuLED_Modular_Passive_LED_Cooler.phtml NO machining needed, just bolt on! Lots of good choices. What is an acceptable temperature rise? 1.34 degree C/W costs $9.91, 0.88 degree C/W costs $14.85. Even if the thermal power is...

"Heat input, 30W. Heat output, 30W. All the cob does is change the form of some of it." But some, hopefully most, of the "heat" output is in the form of light that goes to the plants. Whatever goes out as light doesn't have to be dealt with thermally in a heat sink. My question is how much...

I spent some more time on aliexpress and found these: http://www.aliexpress.com/item/Free-Shipping-2-pieces-50w-Pure-aluminium-heat-sink-for-led-lamp-cooling-DIY-Led-Light/32510221467.html I sure would like to know the thermal resistance. The price is reasonable so I ordered some. I have a...

I really want passive cooling in the lights I'm planning. It now looks like I'll be using vero 18's, putting 6 of them per lamp with an HGL-185H-C1050B.I found these and might adapt them...

I'm new here. I have an idea for a really low cost led grow light to cover a 4 foot square, that I'd like to share. It starts from the fact that "T5" format led lights are quite economical from China and can be had with "respectable" lumen output. My plan is to order 15each 4 foot 24W...