Quote Originally Posted by Weezard
"The datasheets say the 3w 3chip leds put out more lumens/W."

The answer is in the question.

The 15W Ledengin emitters are actually 4 X 5W. dies.
The use about 3W. per die and should last a very long time with decent heat management.
They put out more photons because they are kept in the "sweet-spot" of lumens per Watt.

The epoxy lens makes them as close to "point source" as the need to be.
And they cost less to manufacture than high power, single die emitters.
(They get fewer defective chips per wafer after sputtering).

Bottom line?
Photons per watt per dollar, yah?

Havin' fun yet?

Aloha,
Weeze
I talked to Ledengine the other day. Just so everyone knows, the new 10w chips are the same as the old 15w chips. They are just advertised as 10w because they are driven at 700mA. They said that the chip in all of their Leds is the same, just mounted to a different base, or put in as multi-chip Leds.

When you guys purchased the 15w emitters, what was the forward current advertised. My guess is that it was 1A. Am I right?
warrior #113 Reviewed by warrior #113 on . Calling out to Weezard for LED advice My friend, I've read your stuff here and at Steve F.'s site. I want to build a dedicated flowering lamp using Ledengin 15 watters. (4 reds, 1 blue, and possibly 1 warm white; LM 317's so I can tweak the ratios.) Essentially, a copy of your 4+1 cake pan lamp but built on a 4 x 18" finned heatsink so I can see what's going on under it.) If I were to post my picks for power supply, resistor ratings / values, etc., would you critique and perhaps offer some guidance? I have already purchased Rating: 5