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Well I'm not sure the efficiency of the leds is that drastically different. Maybe though. You said it makes 50% more PAR with only 125w (is that what it actually pulls? says 150w) but I didn't see any umol values for either one (unless you mean max PAR value under the light, which doesn't tell...

Hadn't seen those yet. [edit: gross, those are RB lights, and at $1000 for 150W!] Yeah I figured they were kinda dated using those led chips. But the spectrum looks boss and I'd just really like to see some plants under them. But considering there are no videos or journals, that's probably a sign.

Anyone ever see a grow using the SK450 from Super Grow? They are Expensive with a capital E, $867 for 250w (a little cheaper for multiples). But they seem like quality units. They probably don't use super efficient leds, not by today's standards anyway. There are certainly other and probably...

Still is a whole mass, just with some water on the outside :-p

Oh for sure, it's stupid expensive. But I wouldn't buy a Harley, Benelli, Ferrari, or a Yetti cooler unless I had money to blow. (Hey I never realized how many expensive things end with I.) BUT IF I DID... yeah maybe still not these lights, but they look badass

Has anyone seen this mamajama? http://highpower4s.com $2895 for 300w is pretty high. Supposedly a different kind of led chip. Can anyone explain the difference? Looks like a sick light though. And they have a YouTube video.

@Greengenes707 "1 for 1 with a 1K hps." I saw your YouTube video and the 656g yield. Have you gotten more since? "Lots" of people seem to be able to hit .75+ gpw with hps of all sizes, some even 1+ gpw, maybe not a 250 but I did see on a forum, or maybe a YouTube, 1lb from a 400. And 2+ lbs...

That's Fuckin' Dope

If you want solderless they make conductive adhesives that I think can be used instead. Try and find one with a high silver content. As for the ratio, I think that depends on how long you veg. I have read that 3:1 r:b is popular. At least 2:1, flowering is the business end.

If it's drawing 600w put it over a 4x4 and raise it high enough so that the light covers the edges well, a reflective tent and a light meter would help. That light you posted is like buying the Wal-Mart brand, except from China. Will it work? Sure until it breaks. Except at Walmart you can take...

Area 51 and Onyx make reasonably priced units, less than $3 per watt, and are known to be decent to great. They use CREE diodes and good bins, but they only make smaller units, so you would have to get 2 or more. Advanced LED makes a 350w unit (DS XTE 400) with XT-E and Osram diodes, but they...

Oh I thought the CREE was $35. And the XR-E is a 4w max, according to their website, so 24 must be the actual draw. And they put out 1600 lumens, which yeah is still less efficient, but it would be nice if we could compare umols. Philips actually publishes the umol output of their PAR38 but it's...

@az2000 Hola AZ. I was looking at PAR38 leds online and found these, have you seen them? CREE XR-E diodes, 24w, 3000 and 6500 Kelvin, 60 deg spread, $40-45 and free shipping. Fucking love Amazon. Btw, are you an engineer or have a tech background? Your writeups read like lab reports, detailed...

Ya I said in the first post that blue photons are higher energy (or rather that red are lower) but I hadn't considered the impact of that energy. I had read that different carotenoids and such responded differently to different colors, my mind just didn't make the connection that its because...

http://www.nvcc.edu/home/rgorham/Sites/courses/110/110_Powerpoint/a17bot_BW_(Responses_Hormones_Phytochrome_06)/tsld101.htm

I don't have access to a university search engine. Universities, as you know, subscribe to hundreds of scientific journals and periodicals and have their articles electronically available. An AWESOME resource, if you're still in college. Thanks for looking it up though. Like I said, I am just...

lol I realize not everyone here is a scientist. I have an engineering degree and lots of my classmates were stoners. Surely there are some advanced degree growers on the site. I figured the forum would be a decent place to ask if anyone knew or knew where to find literature on the subject...

I have been reading about photoperiodism and phytochrome ratios and have a question about the plants need for red and far red light. It has been generally "accepted" that the plant wants blue light during veg and red light during flowering. Under this pretense, growers flood their bloom rooms...

Wondering if you are still reading the forum. I had a question about the comments you made regarding light: blue/red veg/bloom. I have read that the Pr Pfr ratio is responsible for for budding, and that when the amount of Pfr drops below a certain level budding is induced. I cannot find any...