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I am just saying that these dies will typically be run at between 1 - 2W and the acceptable power level is determined by the LED die cooling system. 3W is really difficult- I am not saying it could not be done, but with a piece of aluminum and a fan I am saying, basically, probably it cannot...

This is a great question and I am glad somebody asked it. I can see by reading these forums that people are all over the map in understanding LED technology and LED technology as it relates to growers is totally new so there is bound to be a learning curve. I am no genius, a point my wife...

Osram sells only packaged products, not bare dies- our designs typically start with the bare die and go from there, so I am not so familiar with their products. I think they make good products, vertically structured LED's. While you are on the web site you listed please check out the...

stoney- thanks for the pic. This is either going to prove my point for the people who want to know the truth about 1W power dies, or simply reinforce the believers of the 3W myth, see below. First off, let me say I think this GLH guy is probably the most honest of the LED sellers out...

So your pulling 180 out of the wall- a good driver with a PFC circuit will convert at maybe 85-90%, this gets you about 155W to play with, minus about 10 for the fans leaves you with 145W available to power the LED's. With 119 dies your running them at about 1.2W ea. This is reasonable...

Dunit- it's funny, we just get talking about odd 3 Watt marketing claims and then some guy gets on talking about a 12W diode. Ha! You can see where this is going.

No- I think what I am trying to say is the opposite of this. There is a huge difference in radiant output power (light) between a true 1W power die and the collection of little chip dies that are placed on a metal core PCB and these LED sellers are claiming as '3W LED's'. They are not...

sierrajames is right on this- if the bet is 100 quality 1W dies vs. 33 of their so called 3W dies- in terms of radiant flux (which is what the plant needs), I would take that bet any day and twice on Sunday.

Die Efficiency The marketing crap starts with the posting of the AC input Watts as opposed to the DC output Watts that actually fuel the LED junction and ends with multi-chip arrays using very small, inefficient LED chips that they tout as '3W' diodes. It's all marketing crap. 100W of...

Dunit.... Over what size canopy area? I appreciate all your posts, but I have to say, with absolutely no disrespect intended, I believe at 2ft stand-off distance it can be done with true 1W LED's. I say that because these 3W and 5W so called LED's are not what you think they are or what...

'Penetration' is measurable. It is a function of generated light intensity and subsequent light containment over the photosynthetically active portions of the plant- producing a lot of light and then directing the light to the plants- not allowing the light to escape out the sides. This...

sierrajames has it nailed. The approx. 1mm^2 (40 - 45mil^2) LED die is the most efficient, widely available die out there. In engineering parlance, it is commonly called a '1W die'. It is true that the die can be injected with current which would exceed 1W, however when reading a...

Green Dave- thanks for the come back- appreciated. I looked on the website, but like with most of them ya can't tell much what the ingredient list is.

Yo Green Dave- you got one of these panels? Could you post of close up pic of one of the 5W diodes? Thanks in advance. astro

Trust me, believe me- you cannot place a series string of resistors paralleled across a series string of LED's and expect the circuit to operate in the manner in which you are thinking. The resistors will sit there and suck power ALL THE TIME. What is to stop them? The vast majority of...

Is anybody out there wondering why it is, when power is much cheaper than LED's, that all these fixtures are not running their '3W' LED dies at 3W? Why not simply up the power of the LED driver and let it fly? The truth of the matter is this, irregardless of what the specifications game is...

I doubt they are 'resistors' in the circuit as these would not work- if they went cheap they are probably zener diodes with a zener voltage just above what they are expecting or have tested maximum Vf of the LED's they are using. The LED fails (open) and driver voltage begins to approach the...

Ha! OK, you are right. You should call your friends at Bridgelux and tell them you are going to plop their die on a chunk of aluminum and inject 1A of current thru it. Then get a measurement of actual junction temperature and let me know. And no, there is not a bunch of Bridgelux...

Unfortunately the terms that we are now discussing these LED lights have been set by the marketing and advertising people and, as usual, they are wrong. We really need to be discussing the LED on the basis of radiant flux or radiant flux/ Watt- not Watts. The Bridgelux NLX-5 and NLX-6 are...

Hey guys- I have been reading thru this thread and there is a lot to catch up on. In my career I have placed tens of millions of LED devices into various products, so I know something about the technology. The vast majority were small indicator/ display type LED's, but I have also worked...