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The cheapest for that matter. But it may be true especially for generations of strains bred under bulbs.

As I said, you're right it's no big deal. But, being cynical, that also goes for doing a 360 jump everytime you open the tent. What purpose do you think this sunrise emulation serves? Besides, I was rather referring to people having the 730s on the whole day. If this turned out to be enhancing...

The Pfr (plant is "awake") is generated by 660nm light, something that is prevalent in almost every grow light source (at least it should be). If the light is on, the plant grows. Whereas Pr is generated fast (plant is set to "sleep") by 730nm light, something that isn't there at all when the...

In my opinion, 840nm is a waste, because the Pfr absorption peaks at 730nm. http://publishing.cdlib.org/ucpressebooks/data/13030/n2/ft796nb4n2/figures/ft796nb4n2_00082.gif I would neither use 730 in the morning nor for the whole time. For me the only point about 730 is tricking the plants...

Yes, well, no. You can put 5 V29 on 185H-C1050, I have done that. I was always wondering if 4 V29 would work on 185H-C1400. Same goes for 3 V29 on 120H-C1400. Apparently it does, although I haven't seen it yet.

Has anyone besides Supra tried this configuration? It seems like the max Vf of the driver is exceeded by 4 Vero29 in series at 1400mA. What will happen? Does the driver go into limp mode? Does the driver scale down the If, if so, to what extent? Looking forward to having this finally answered.

For drilling, a drill stand really helps, for it ensures perpendicularity and you can adjust max depth to not hit the fins. For the Veros, I drilled with M2.5 -To my suprise, this may take some time on 600RPM, I thought the material was softer. I'd then tap in three steps towards M3 (with...

The mentioned driver provides 5,72A. With sufficient cooling (e.g. a topclass CPU cooler) there would be no problem at all to run only two V29 in parallel. Let one have 3,3A and the other 2,42A, it would still be fine. IF one fails, you would have a very short response time, most likely the...

That was with 5 V29 (2x 1.2, 3x 2.0). I don't remember the exact values, but it was 230 Watt on the multimeter. Even after power factor correction (*0,95) that is too high for the predicted ~191 Watt of cob dissipation. I have to admit that my cheap energymeter showed 215 W actual draw which has...

Didn't actually build a fixture will parallel cobs, but thats only for the reason I just order what I need and don't have any spare parts. I always check with a multimeter afterwards and it didn't fail my previous educated guesses yet (besides the fact that my 185h-C1050 turned out to have less...

I'd buy like 20 of those cheapo "100W Cobs" (5$ each) and wire them in parallel on a single large heatsink capable of dissipating 200w of heat. The more highly underpowered chips you got in the string, the more failsafe it is. Use it as a veg light or illuminate a work space.

Wait, what? Pre-order? New veros?

@caretak3r Yeah, nice. How long is the post? At what voltage do you run the Alpine fans? Have you got a thermo gun and can check on the temperature gradient between heatsink 1 and 3? By the way, as you use the light at an 45° angle, canopy intensity might benefit from some 90° reflectors. You...

I also like the idea to capsule the fixture very much, because it gives a more finished look, eases the handling and helps against moisture. The fence posts are nice and cheap, too. For greenhouse lighting, the reflective surface doesn't consume too much sunlight. But whenever you put a case...

I thought the same initially, but I had doubts about the thermal performance. I tried covering the Alpine11 with another reflector/candle bowl, so the air that is blown down through is sucked upwards again. After a few minutes it already got way warmer than the other heatsinks. Covering...

Bump! Craving for some fresh designs... What have you got?

With 5V it doesn't hurt too much.

That is correct, but if one cob fails you have 4.4 Ampere on the second cob, which exceeds the max driving current. That cob would then have around 180 watt of input. With an efficiency of .31 it will produce 125 watt of heat!

Yes it could, your PPFD would rougly end up in the 800s, which is ok. However, when running in parallel I would always consider a cob failure. In your case, running only two Chips, a cob failure on one chip would most likely fry the other one in no time. Of course, this depends on your cooling...

Is there anything to gain using the 72V class? You need even higher voltage in a series string, which might be more hazardous in a damp environment and/or for newbie assemblers.