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They probably have their place in some Micro Grows or maybe veg rooms.BUT the diodes you mean (the round ones, you know) aren't efficient or worth using at all, the technology is a few decades old and outdated in terms of radiometric efficiency, even CFLs are better. There are E27 bulbs with...

The Silkroad guys recommended the following:- no hand written labels- smell proof bags (the ones you close with your electric iron)- USPS because they need a warrant to open your mail

A red dominant light with some blue and white for added spectrum coverage. If it's free I'd build a 1000W beast :D Copper MCPCB's without a dialectric(=isolating) layer are worth it! Some LED's depend on good thermal transfer, e.g. red XP-E: As you can see they loose flux quickly with rising...

I agree that the high lux coming from the small surface of LED's is harmful to the eyes, apart from that what eye protection is actually useful and worth the money? Are laser protection glasses viable?

XM-L2s, Oslon 660nm, XP-E2 630 all running at 350mA on copper mcpcb's :D With roughly 50% total efficiency, just a dream though!

I hope to be able to clarify some things. Efficiency HPS has a (radiometric) efficiency of 40%, i.e. 40% of the power drawn is actual light output, which is really good (T5's are at lousy 15%). LED's do already offer higher efficiency with more than 60% (mostly blue LED's). And because most LED...

At Mouser for example.

At Mouser they are! Same bins, same efficiency for the color XP-E2.

Nice build but I think the sheet of metal you're using as a heatsink will probably be your limiting end.

Heck, you're right, at least they got rid off the lower bins. How do they compare to Oslon color leds?

Yes, those XP-E2 are already available and probably the most efficient color leds today. Where do you get the information about radiometric efficiency from?

Yes, you can use XP stars, they have the same footprint (3535). Lead free is just a pain in the ass imho.

Are you sure about the R3 bin? According to the XT-E datasheet, there is no R3 bin with 3000K tint.

After finding the 95 CRI Oslon WW LED and discovering the perfect spectrum of those, I went a head and took a look at other High CRI (>90) LEDs from different manufacturers. Oslon 95 CRI WW (LCW CQ7P.CC): Nichia 119 90 CRI: Both are warm white LEDs with a color temperature of...

XM-Ls should be even more efficient. But what I wanted to say, is that the yellowish (2,7k-3k) High-CRI LEDs probably have all the same spectral distribution (good color rendition is achieved by the same colors being dominant, doesn't matter which company), peaking at 625nm and ranging all the...

Nice, waiting for your results! I just looked through the datasheet of the 95-CRI Oslon and compared it with a Nichia 119 2700K 90-CRI, the spectral distribution is almost identical (the Nichia has more blue but the reddish graph is the same). A lot of deep red seems to be the key to a high...

Love the LED threads on rollitup! After looking through some threads, most of the guys seem to be using Cree WW LEDs, especially XT-E, my question is, what's the way to go here, more efficient Cree emitters or better spectrum with the Oslons? Do you have experience with this? (esp. guod and SDS)...