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I use led strips. In my Case Samsung F-series Gen 3, but here are plenty of options. Indeed summed up mostly by 1212ham Led strips gives a better light distribution compared to quantum boards too. Which allows you to hang the fixture lower and then lose less light on the walls (while keeping...

A 1000W SE HPS is measured to emit about 1400umol/s out of the reflector. The 550 V2 is advertised to emit 1178umol/s. So, that's about a 20% difference in usable light. Thing is, in the US people tend to put a 1000W light in a 4x4. Which is really too small for that size light. This causes way...

Yes you were. You just don't understand that you did. Just use your calculator. When you get 500umol/s/m2 at 40" how many umol would that same light source give you at 5"? 32000K yes. That's the only thing of all that you say which is true. The only thing that does say is that the light spread...

You multiply the the total number of m2 by 800umol/s and divide the light sources uniformly over the space. Height is not relevant for that. Ehm I just said: Height is only relevant for distribution. When you need to spread light over 10m2 you need more height then when you want one COB to...

Yes and it's utterly useless. Especially the way you apply it with that penetration nonsense where you left out the top part. You need 25600 or 32000umol/s/m2 at 5" to still get 400 or 500umol/s/m2 at 40". If ISL actually applied! So you were comparing a 25600 to 32000umol/s/m2 stadium light...

Are you seriously claiming that you need 100 times the amount of light when you hang them 2 meters high as opposed to 20cm? They don't need "so many". You simply need say 800umol/s per square meter of grow area (or whatever you are going for). It does not matter if the lights are at 20cm or 2...

That link only contains utter nonsense.

No it does not. The point is not that inverse square law does not occur at all, but that when you reflect light back into the same space it does not spread out according to a "square law". You are then only left with reflection losses and inverse square is irrelevant for a grow room with...

This thread is a hoot and a half. Insecure HPS growers are so sad, it makes them funny as hell.

Well that's what I said in the quote you replied to ... Even then though. It will matter just about nothing. Like I explained, the drivers are above the plants and the (convection) heat they emit rises up and into the exhaust out of the tent. I have tried with both drivers directly on the...

No why would that matter? Sure if you constantly live in above 28C (82F) the saving a few BTU of extra heat might make some sense, but even then it's negligible. These drivers are 94% efficient. Do you really think adding 6% more heat is going to damage the plants? Besides, it's convection...

Why bother mounting the drivers outside the tent though? Usually with leds the issue is that temperature in the tent is too low. That tiny bit of extra heat is even welcomed. I find it much easier to install a fixture when I only need to plug in the power cord into the fixture. On my first led...

Yes, like I said that's for 115/120 degree beam angle. Of course when the beam angle is narrower the light needs to hang higher for adequate uniformity and when the beam angle is wider the light can be lower. That's how I explained in an earlier post that I mixed four 150 degree far red leds...

Well technically beam angle does. Still you can indeed calculate light distribution given the beam angle and height and number plus distribution of light points if you You can calculate Yes if you compile a couple of million of those calculations then yes. No it is not. My "ISL calculations"...

It doesn't really "diminish", but yes the light gets more spread out with greater distance. Light does not disappear from distance, but it spreads out. Which doesn't matter since it's still there and it will overlap with the other UV leds. You really need to stop thinking in terms of "inverse...

I did, as an example of an actually utterly useles metric. But just keep sleeping

Yes, I have written a simulator that does the same yes. It does millions of "ISL" calculations. However, the point is that for the height and distribution of light of a FIXTURE (as in an "array of distributed light points") as a whole, Inverse Square law is simply irrelevant. Mylar and plastic...

No, you misunderstood. I'm showing how his example would work out if ISL actually applied like he claims it does. Or in effect how idiotic it is. Either way, That nofsgiven chart that Randoblame posted is complete bullshit. Again, I'm truly flabbergasted that he posted it at all. So? The circle...

No, it was all complete bullshit. Just stop. ISL does NOT apply in grow rooms for entire fixtures and therefore his tools and opinions were all useless. Also, you should not be adjusting PPFD by hanging height and all these matrices are really useless. The correct hanging height is solely...