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280mm one has 24 561Cs. 560mm one has 48 561s QB304 has 304. 12,67 280mm ones are 1 QB. QB was 75 dollar last time I checked. So unless the strip is under 5,91 dollar, the QB is the better deal. And you need to buy 100 280mm strips before it's under the 5,91 dollar line. That's quite a lot...

I don't think the center of the COB would be the hottest since the diodes inside the board are all spread around evenly. (mostly) So thermal draw should be spread evenly around the LES. Or just about. But if you're talking about the heatsink, the part directly above the LES will be the hottest.

I wonder how tomatoes would do under my current LED bulb panel. (120w currently) My pepper plant's stem is thick as fuck already and it has extremely stocky growth. Edit: still have some tomato seeds.

http://www.cornellcea.com/attachments/Cornell CEA Lettuce Handbook .pdf See page 10 and 13. Uniform light distribution is required in the Pond Growing Area. A supplemental light intensity within the range of 100-200 µmol/m 2 /s (for a total of 17 mol/m 2 /d 1 of both natural and supplemental...

Well, if you use the same heatsink for the 3590s and 2530s then the 2530s should run a little cooler which puts their efficiency closer to the 3590. Can't say by how much though. QB288 at 1.4A is about 55-56% efficient. Should be around 950 PPFD, that's very good. Wouldn't go higher unless...

And again you are not accounting internal reflections that will happen inside the water filled condom. It's a conservative estimate: "To be conservative, assume LEDs convert 25% of the input power to light and output 75% of the input power as heat." This is what Cree has said a couple of...

Reflow soldering is much easier on a mass scale than drilling+tapping+thermal pasting COBs to heatsinks. COBs also require better heatsinks because for example 25w of heat power is concentrated on 1 square cm as opposed to 5cm^2 for SMDs. SMDs also offer a more even spread. (depending on the...

What heatsinks are you going to use? Will the 2530s have smaller heatsinks, or the same? The real truth is that light intensity is king and colour temp doesn't matter that much.

Why are you assuming only 10-30% of the light energy will be lost? Why don't you think it's possible it's way more? Do you understand internal reflections? You have no way to know how much light energy is actually being lost in the condom. A sphere is far more accurate than your test. Why...

And you don't think your way of measuring this is flawed? The balloon is still trapping a lot light, transmittance isn't the only factor. If light exits the surface part will be reflected back into the balloon, depending on the angle it's a small part or everything can be reflected back...

A lot more efficient An XTE Royal Blue is up to 57% efficient at 0.35A for example. http://www.cree.com/LED-Components-and-Modules/Products/XLamp/Discrete-Directional/XLamp-XTE-Royal

Maybe 60-70 grams with the 2 26w CFL bulbs. It's better to use generic warm white LED bulbs and removing the bulb/diffuser With some ceiling sockets, a piece of wood and some pretty simple wiring thanks to wago connectors you can get a great growlight. Don't even need a drill since most wood is...

1 plant. Expect 50 grams at most.

Update time, screwed in another 20W Osram parathom a few days ago.

Because the light will also turn into heat eventually, and since that light stays in your room it becomes heat in your room. Photosynthesis stores some energy inside the plant (doesn't become heat), but photosynthesis is rather inefficienct so you can safely ignore it. So 1200W will always be...

Yes, good LEDs put out more light. That light eventually also turns into heat.. Photosynthesis while endothermic is very inefficient so negligible. Energy that's stored inside the plant doesn't turn into heat (only a very tiny amount). So 1200W of LED practically produces just as much heat as...

I feel like using hydroponics is cheating. Aeroponics too, if that even works with such a small container.

My current pepper under generic warm white LED bulbs. Pics are from 4 days ago, pepper has already grown quite a bit.

When you want to make profit but you don't want to or can't deliver the highest quality product you can do 3 things. You either price your lights according to their quality. If you can drive down pruduction costs you can play the delivers most performance per dollar Or you do the gamble which...