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I want to build a fixture just like @bizfactory has: two bars, 5.88, with space between them for the driver and boxes, very clean. Works for spread as well. I spec'd out 6 cob's and a 240-1050 but it came out to be not as effective as the 5 cob light with a 240-1400. It would be fine if they...

What driver would I need to run 6 cob's efficiently at 1.05a that would achieve that?

Supra put together some build recipes based on efficiency, it appears, but jumps from 5 cob build to 8. For my purposes, it looks like any way I go, the 5 cob fixture is less flexible design wise but more efficient running wise than a 6 but I'm sure I haven't taken everything into account. I...

So what's the best 6 cob recipe??

As far as efficiency charts, are you referring to the cob/driver matching spreadsheet? Actually, the 10" or 12"is what I was considering.

How about 5 3070's vs 5 3590's on a 240-1400? It's slightly less efficient but what would the par watts and ppf difference be there? Would 5 cob's in a line affect my spread? What about a wider heatsink with the cob's staggered one left edge, one right edge for example?

Yup, that makes total sense. Faced with a similar situation, I would feel just as you do.

That's what I've come around to. My build will not be the same as I had originally planned. When I built my last box, I did a lot of things on the cheap and ended up changing over later to what everyone said would be the best thing for my situation. I spent lots of money I didn't need to as a...

My humble thanks @BOBBY_G :-)

You know, when comparing the data sheets of both cob's, the 3590 looks to be between 2500 to 3000 lumens higher than the 3070. Of course it's all about how you drive it I guess..am I not looking at the right numbers? Looking back on this thread, it's pretty amazing you all put up with my...

Correct. The wattage, I think, probably represents a "mean" throughout the series. The data sheet references that number as wattage. After I asked that question, I looked up the cob/driver matching then compared the wattage and number of cobs for each driver series but that have the same amp...

What effect do the different driver series have on output? For instance, what's the difference between the 120, 185 and 240? I understand that these numbers represent the wattage of the driver but how does that affect the output?

Holy Side Lighting! What the hell is that?? ;-) Edit: is it really over $2300??

I was just teasing.. You've been great answering all my questions.. Thanks much! Ha!

And what's the power draw from the LEDs on the fans?? Which driver did you use for those? Lol!!

I agree with ja-cob ;-). The guys from those companies are here helping us build lights and for those who aren't otherwise capable, selling quality lights that are well built and productive. I wouldn't do business with anyone but these guys unless I absolutely had to. Their contributions to...

Is there a formula to determine the watts drawn from the wall? I'm sure this is partially on the driver data sheet and cob spec sheet?

Yup! Saw that. It seems that once you're around 85% of driver capacity, with the 240 series anyway, the efficiency is minimally affected if at all. That answers a lot of questions for me and effects my build approach. You've helped me a lot gg. Thank you very much. :-)

I downloaded the data sheet but didn't know that was there. Thanks for that!

So if I'm not completely "filling up" a driver..say it can power up to 4 cxb3070's but I intend on running only 3 instead, am I really hurting efficiency that much and if not, what other consideration is there in doing this?