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

4 posts / 0 new
Last post
jimahi
Offline
Last seen: 1 hour 3 min ago
Joined: 10/17/2015 - 08:25
Posts: 71
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
Offline
Last seen: 4 hours 23 min ago
Joined: 08/30/2016 - 14:12
Posts: 2630
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 51 min ago
Joined: 09/07/2012 - 17:04
Posts: 10846
Location: Amsterdam

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

stephenk
stephenk's picture
Offline
Last seen: 2 hours 15 sec ago
Joined: 01/30/2016 - 05:09
Posts: 1037
Location: Brisbane, Australia

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