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Because boards are twice as expensive. To do what you suggest you'd be spending 4 times as much as you would with a strip light.

Yes you can take away that you get exactly the same with boards. A board is simply a slightly bigger COB/puck. yet with COBs you'd generally hang a lot more of them and therefore you get more and smaller hotspots in return. ie they are actually better at ditributing the light. for instance see...

OK that one is a bit harder to understand perhaps, but that does not help penetration or anything for that matter. Light doesn't "penetrate" deeper because it all originates from one point. Light penetrates deeper when it can more easily slip through the canopy. That what you get with spreading...

You dispute common logic Lol, you are too funny. I didn't fake anything. I created one of your poor looking par maps because you insisted I use that shitty format. Those charts are completely useless and look like you drew them in paint anyway. But still I drew one to show what it would look...

Yeah Chilled Growcraft X6 was recently tested by Migro in real world tests and it was the most efficient light he ever tested at 2.39umol/W: HLG QB96 comes out at around 1.98umol/J:

If you can do DIY, save yourself half on the purchase of the light, plus get better quality ligh and go with Samsung led strips.

Nope, led strips give you better penetration. As explained a few posts up Led strips offer by far the best spread of light points and therefore the best light diffusion and thus light penetration.

A 2' strip Samsung H-Influx or F-series Gen 3 contains half the leds of a board. Two strips are about half the price of a board. So strips would be cheaper. You don't need an expensive heat sink either. Just mount them to aluminium U-extrusions. Also something to keep in mind, hanging the...

Well it made sense to compare to HPS too. People had a 600W HPS or 1000W HPS and wondered what led would replace it. Without needing all kinds of calculations to do the comparison. Unfortunately the led manufacturers lied about their figures. So there is (rightfully) a lot of bad blood on those...

It's not that easy though. Different HPS bulbs can also have quite a different efficacy. So what is the manufacturer of the fixture going to say? And it doesn't end at bulb efficacy. A double ended HPS bulb might be rated to produce 2100umol/s @ 1000W. Is that enough data? But then the...

Well it's sort of in direct relation by factor of the efficacy. Say you aim for a light production of 800umol/s per m2 and the light you are thinking about has an efficacy of 2.5 umol/s/W then you'd need 320W per m2. If you know you need 800umol/s per m2 then you still don't know what driver...

@TheRealJPeterman Exactly. Airwalker has some beef with this company apparently. Indeed you can buy stuff cheaper if you get clones from China. Still, they won't come with a reasonably warranty or even a guarantee that what you get is as advertised. To claim that the stuff on Alibaba is...

I said that 8 led strips was the only similarity between the two. The other link is also clearly not the same. Just because it utilizes perhaps the same hinge, doesn't negate that 37"x37" is quite a different size as 41"x42" So it all boils down to that you think it might be from the same...

So that's a random led strips light on Alibaba that apart from also having 8 bars otherwise looks completely different from the actual "optic slim 600H"?

I have mentioned the references in my posts. But yes Migro and Ledgardner did plenty of real world tests. Are you doubting their numbers? They consistently get 1.9umol/J for supposedly 2.5umol/J in a 4x4 and 1.3umol/J in a 2x2. For Growcraft X6, Lumatek Zeus 600w Pro and other strip lights do...

I'm not trolling. Just pointing out the obvious. I got the same nonsense when I went against the stream to say that reflectors on COBs were stupid. I was trolling, didn't know what I was talking about. 6 months later people finnaly started to get it and reflectors started disappearing. Same...

Irrelevant. Either way, the Zeus Pro 600W was measured in exactly the same way with only 15% loss in a 4x4. Versus 25% loss for the qb. And yes in a small tent the wall losses are staggering. They just are. The point is more that it's twice as high with a qb than with a properly spread out...

Yes and in that case the average PPFD for the 650r is 415.99 (with ridiculous accuracy an symmetry). Which should have been 934 according to the sphere test. So 46% of the light is not measured. What's the point of these matrices. Those wall-less matrices were what Burple manufacturers came up...

If you make the light fixture smaller you will need to hang it higher to allow it to spread over the same surface area again. You won't see any difference in light angles from that high up and that concentrated a light source though. It's essentially focused source again. That's the problem...

Plants have the same. If the angle is not correct the photon will just heat up the leave instead of be used for photosynthesis. Either way, the Zeus Pro 600W was measured in exactly the same way with only 15% loss in a 4x4. Versus 25% loss for the qb. And yes in a small tent the wall losses...