mtg2

[degarb]

http://www.cree.com/led-components-... Modules/XLamp/Data and Binning/XLampMTG2.pdf


http://www.cutter.com.au/products.php?cat=Cree+MTG-2


I must say I do not understand the lumen/watt, as below. Also, notwithstanding the reasonable viewing angle, probably impossible to get a good beam pattern. But with 5 cells (necklace headlamp, or one 6 volt agm) it should be a very bright with only need of one $3 variable resistor for dimming needed.

Help me understand with these pdf numbers:

6 v 2200ma = 13 wattish

170% of nominal (400 lumen) % = 680 lumens = 52 lumen/watt



or...

.182 ma x 6v 1.09 watts

30h bin (90 cri) : 500 lumen, or greater than 500 l/w (cannot be right) !

 

[AnAppleSnail]

.182 ma x 6v 1.09 watts

30h bin (90 cri) : 500 lumen, or greater than 500 l/w (cannot be right) !

30H is a chromaticity, not a brightness bin. I'm sure you know, I just want to be clear here. A G0 brightness bin on the 6v model (pg 3) is up to 520 lumens at 85C at 1.1 amps. With 6v times 1.1A, we have 520 lumens in 6.6W, or 78.8 lumens per watt. I believe that your confusion comes from the test current for the 36V model, which gets 598 lumens at (36v times 0.185A=6.7W) or about the same efficiency.

In short, no, these LEDs do not produce 500 lumens at 1 watt.

Careful with datasheets! Especially one that's really three product lines.

 

[videoman]

The Cree product characterization tool still does not list the MTG-2 among the most recent leds. That would have been an extremely easy way to get lumens/power comparison with other Cree offerings.

 

[Z-Max]

I cant understand another:
MTG 36 V - termal resistance 1.5 C/W, max. current 0.7A
MTG2 36V (with better efficiency and equal resistance) - max. current 0.5 A/ WHY????

 

[CarpentryHero]

This'll be brighter than than the sst90 according to tests I've seen on another site. Exciting times for LED's :D