4235Views8Replies

Author Options:

5 mm led's 8 LUMENS PER WATT!?!?!? [answered] Answered

well i was thinking, 5mm LED's take about 1/10 of a watt, correct? 

and from this calculator found out Cree 5mm led's are .806 lumen's. i assume they are 1 tenth of a watt.

well, my calculator states they are 8 lumen's per watt (if i could run them at a watt.) 

i figure they are 1/10 of a watt because because this 500 led light makes takes about 50W as in the video and led's give less than a lumen of light.

so far, it seems leds just last long and emit blueish light.

is incandescent light better? with 20 lumens per watt from halogen?

8 Replies

user
steveastroukBest Answer (author)2011-06-04

WHICH 5mm leds ? It matters.

The Cree 5mm leds I just looked at are nearer w 30 lumen/watt
C503D-WAN

Steve

Select as Best AnswerUndo Best Answer

user
-max- (author)steveastrouk2011-06-04

well, just general super bright white leds. like the ones on ebay. 10000 mcd 30 degrees

Select as Best AnswerUndo Best Answer

user
steveastrouk (author)-max-2011-06-05

GIve me a link.

Cree is a superb state of the art/ leading edge, brand, ones on Ebay, not so much. Cree's researchers are some of the best in the business

Select as Best AnswerUndo Best Answer

user
-max- (author)steveastrouk2011-06-08

i know. the amazing xml t6 is 100 lumen's per watt at 1000 lumen's, and 130 lumen's at 1 watt. it is also very small! but im just talking general super bright leds. eaby, superbrightleds.com, and radioshack.

Select as Best AnswerUndo Best Answer

user
-max- (author)qwerty1562012-03-08

i dont think there that efficant, after all, quality cree 5mm leds are only 30lm per watt...

Select as Best AnswerUndo Best Answer

user
qwerty156 (author)2012-03-08

it doesn't really matter what you think or not, the truth is that CREE XML U2 bin in cool white can easily achieve 140-150 lm/w when driven at 1 Watt

Select as Best AnswerUndo Best Answer

user
-max- (author)qwerty1562012-03-09

that's a power led, i have a few XM-L t6 1A led these are power leds, are not 5mm leds, 5mm leds are 0.099W about 1/10 watt at full power (30 ma @ 3.3V) and the 5mm cree led (hard to find on there site) says its 30 lumens per watt, but it dousnt even consume a watt.

Select as Best AnswerUndo Best Answer