Cree X Bright LEDS - Picture included

Floating Spots

Enlightened
Joined
Aug 7, 2002
Messages
667
Location
Elkhart, IN
Long time lurker, first time poster.
cool.gif


Any thoughts on these?
I know different manufactures rate LEDs differently, but this could be very interesting......
Anyone have their hands on these?

<br>
<br>
Image1.jpg
 

Lux Luthor

Flashlight Enthusiast
Joined
Nov 10, 2000
Messages
1,944
Location
Connecticut
Could these be those mysterious new 12,000 mcd LEDs mentioned in a recent thread?

I had only half believed it.
 

e=mc²

Enlightened
Joined
Oct 2, 2000
Messages
537
Location
NJ - Land of malodorous \"earl\" refineries!
I have received a sample of the LEDs and the white ones are definitely bluer than the current run Nacias, NSPW500BS series. For some odd reason, Nachia seemed to make their led "warmer" than my original lot of 5600mcd ones rec'd in 2001. But on a side note, the White CREEs to my eye, seem much brighter than the Nachia. I don't have yet a light meter, as the cost is prohibitive ($250+). Anyone know where I could get a light meter? I'm not looking for any fancy options like data logging as I am on a shoestring budget at the moment.
 

McGizmo

Flashaholic
Joined
May 1, 2002
Messages
17,290
Location
Maui
Question:

Looking at the data sheets, it would appear that the Cree LED in discussion has a 1/2 theta beam angle of 15 degrees. This would explain the higher mcd rating compared to the Nichia NSPW500 which has an angle of 20 degrees. This 10 degree overall difference in beam angle would explain a higher mcd rating even if the dies themselves put out equal lumens. Could this be the case? I also noticed that the LED's have a max If of 20 mA whereas Nichia is 30 mA and will put out more light than the specs show (based on 20 mA If)

Regarding e=mc2's comment on color, did you note the color rank on your latest batch of Nichia's? I think this could explain the disparity. Nichia even has a new 500BS with a dF color rank which they call "incandescent" and these really are warm to the point of being yellow white. They don't appear to be nearly as bright. I have forwarded some on to Craig but doubt he has evaluated them yet.

- Don
 

Slick

Flashlight Enthusiast
Joined
Apr 24, 2002
Messages
1,264
Location
Nor Cal
Originally posted by e=mc²:
I don't have yet a light meter, as the cost is prohibitive ($250+). Anyone know where I could get a light meter? I'm not looking for any fancy options like data logging as I am on a shoestring budget at the moment.
<font size="2" face="Verdana, Arial">Here ya go! The Wavetek / Meterman LM631 is somewhat of a "deFacto standard" on CPF. This meter does EVERYTHING I need for $90 (w/S&H). Don't forget the "promotion code" for the free multimeter, it's really pretty decent.
 
Top