Recent content by lenngray

Greetings savolainen, Just in the interest of having you avoid unnecessary glitches, except for the Haight lights, I don't think any current lights count on passive cooling of the LED chips. There's a radiative curve that goes down significantly as junction temperature rises. Presumably that...

I don't know why nobody gets the point. It's a well-acknowledged FACT that 70% of the energy put into an HPS is lost as heat. This is partially in the balast, and partially in the bulb, which gets HOT. This allows the potential for 3.3x as many IDENTICAL photons to the HPS to be generated by...

Actually, they could not be counting green and yellow of HPS toward that 70% heat "waste", as those represent an actual majority of the "lumens" that make up the 55,000 of my 400 Watt HPS. But, since you bring it up, I'll insist that the actual "not knowing" is in the arena of "where is all...

How 'bout someone explains why, if an HPS wastes 70% of its energy making HEAT, and LEDS, which necessarily generate soooo much less HEAT, and can put all that available energy into making something OTHER than heat (hmmm, what might that be), that with all the genius of targeting all the energy...

I appreciate the technical info, but I'd also like whatever explanation you can give for the "photosynthesis rate" that appears at: Photosynthetically active radiation - Wikipedia, the free encyclopedia It seems to show something like a 25% "rate" for 555nm green which your absorption spectra...

You're alluding to the replacement costs of an HPS bulb? Even if I decided to replace the bulb every 6 months as some have implied was necessary, I just looked up a replacement for my 55,000 lumen 400W as $20.88 shipped, so you're talking about the 9 x that, to be added to the cost? What's the...

So, Buckshot, you do understand that the thread "The Truth about LED lights" started, a year ago, with a post by a seller that included the line: "If you get about 300-400watts of LED lighting, you can replace a 1000watt HPS or MH system." Yes, and to the extent that that's true, if I get an...

Yes, the general concept of the constant-current supply was what I was describing. In fact, the current-supply itself contains an effective resistance and a voltage source -- which needs to be able to increase until the current is as desired. Feedback maintains the target current. But the...

Actually, I'm more than a little averse to fraud. I'd be all in favor of taking the cost per gram over 5 years, but if we just wait without being willing to look until then, it amounts to condoning 5 years worth of fraud. When NOBODY is reporting 2-3 grams per watt with LEDs, it's not...

re: "The reason the stated wattage and actual wattage differ is because the stated wattage is the sum of the number of diodes x max wattage per diode, for example 100 diodes x 3watt = 300watts. The actual power draw is always less with LED lights because each diode might draw anywhere from...

So, apparently hosebomber, in another thread, gave some definitive data about this, debunking the 1/3 the power, and thus the 3 grams per watt. So, the yield we'd be looking for for commercial lights is 1.5 grams per watt. Is anyone getting that? With whose lights? Note that it's only with a...

Apparently hosebomber, in another thread, gave some definitive data about this, debunking the 1/3 the power, and thus the 3 grams per watt. So, the yield we'd be looking for for commercial lights is 1.5 grams per watt. Is anyone getting that? With whose lights? Note that it's only with...

I'd love to hear about anyone's results in taking advantage of LEDs' minimal heat generation to use low-tech CO2 to increase yield without losing the CO2 to the venting of heat.

I'm not sure if I'm missing something, (I just started following up details of what people tell me), but on SteveHman's 780W LED grow, he wrote, on changing from 600W to 780W, "My goal for this grow is to net a lb out of it. I netted 3/4 out of a 2x4 space, so upping the watts by 180 and adding...

But those single points are really, as I gave in my example, 200 single points rather than 525. It's the difference between an array of, say 14x14 versus one that's 23x22. As for the DIY, since starting this conversation, I'm considering a transplant of some Alibaba 660nm chips into an old...