XP-L2 emitter - Are the spots on the die normal?

4 posts / 0 new
Last post
jimahi
Offline
Last seen: 5 months 1 week ago
Joined: 10/17/2015 - 08:25
Posts: 79
Location: The Tropics
XP-L2 emitter - Are the spots on the die normal?

I was taking a close-up look at an XP-L2 Easywhite high CRI emitter and was wondering if anyone else noticed that the illuminated die on these new emitters does not look as “smooth” as in previous Cree emitters.

You can see in this image that there are random areas of dark spots on the die. This is at very low current so that the die barely turns on. Of course, you would not notice this at higher levels of brightness.

I think this is due to the way the phosphor is deposited as can be seen in this Cree image from their website. It looks like the phosphor has more of a rocky gravel looking surface versus a smoother surface as in previous CREE emitters.

Edited by: jimahi on 10/11/2017 - 00:16
Lightbringer
Lightbringer's picture
Online
Last seen: 3 min 16 sec ago
Joined: 08/30/2016 - 14:12
Posts: 5228
Location: nyc

Yeah, I think even the G3 has that mottled appearance.

09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

djozz
djozz's picture
Offline
Last seen: 1 hour 3 min ago
Joined: 09/07/2012 - 17:04
Posts: 12516
Location: Amsterdam

…and one of the reasons that the dedome trick does not work with the newer Cree’s.

link to djozz tests 

“I used to think that top environmental problems were biodiversity loss, ecosystem collapse and climate change. I thought that thirty years of good science could address these problems. I was wrong. The top environmental problems are selfishness, greed and apathy, and to deal with these we need a cultural and spiritual transformation. And we scientists don’t know how to do that.”   (Gus Speth)

stephenk
stephenk's picture
Offline
Last seen: 3 hours 57 min ago
Joined: 01/30/2016 - 05:09
Posts: 1267
Location: Australia

Yes, perfectly normal. Same for XP-G3 as well.