Beamshot request: XP-L 2C Domed Vs. XP-L 2C Dedomed

[AlexGT]

Hello guys,

Does anyone have a side by side beamshot comparison between a XP-L 2C Domed (Stock) led Vs. a XP-L 2C Dedomed led taken in the same picture? I tried to locate one but could not find one.

Also while searching found this thread, RaceR86 comments of not good results of a 2C dedome (turns greenish)

de-doming: illustrations for color changes and increased luminance

Two typical color shifts are known for de-domed LEDs: - color becomes always warmer (see DrJones explanation, https://budgetlightforum.com/t/-/13495 ) - some LEDs also show an unpleasant green shift But what system is behind these color changes? I was so curious that I have inspected a handful of LEDs (six Crees and one Nichia) with a colorimeter (Spyder4 sensor + HCFR software). No LED color bin flux bin (just for completeness) 1 XP-G2 7C4 R3 2 XM-L2 7B4 T3 3 XP-G2 5A2 …

I also found something new to me, member sma tried a “Dome squeezed flat” method. What is the correct procedure to flatten the led dome? Could it work with the XP-L led? maybe this is a good alternative to getting a smaller hot spot without dedoming

I was wondering if it would be a good idea to create a beamshot database of all the led tints members have dedomed with the results obtained…

Thanks in advance for your help!

AlexGT

[musicmagic]

I think dome squeezed flat was just a piece of glass pushed on top of the dome. speaking off the hip, I fear breaking bond wires.

also it was discovered that the xp-l has a little bubble on top of the die, so the dome is reported not to touch, so de-domes should happen a lot nicer.

[AlexGT]

Bump! 0:)

[3Tronics]

It’s not quite what you were after, but I’ve done some with an XP-L V5-2A the two on the left are dome on, and the two on the right are de dome.

The dome on hotspot is a lot floodier in real life, the camera just picks the hotspot up more whereas the de dome photos look almost exactly the same as real life.

Pictures were taken with the exact same light, and an OP reflector

!!

[sma]

@AlexGT

member sma tried a “Dome squeezed flat” method. What is the correct procedure to flatten the led dome? Could it work with the XP-L led?

I did so by pressing a piece of thin glass onto the dome.

However, this picture illustrates that this method does not increase luminance, which is the point about dedoming. So this method is the last you'd want to use :-) . The point of that experiment was to illustrate that the increased luminance is not cause by a smaller apparent die size, but by another effect.

Even if it were a useful method: silicone is quite rugged, you would have to retain the pressure, which would complicate things.

[AlexGT]

Thanks for the pic James, I wanted to see how much was the color shift of the 2C tint when dedomed.

Thanks for replying sma, I thought you had found a way to permanently flatten the dome, I was speculating you might have used a very hot flat metal pressed against the dome.

[texaspyro]

I don’t know if it applies to the XPL, but I did measure the color temp change on some XMLs and XML2s:

XML and XML2 de-dome color temperature changes

I de-domed an XML2 T6 3C LED. The original color temp was 4820K, a rather nice neutral white. The de-domed color temp is 3068K… standard halogen bulb warm white. Light output went from 865 lumens to 700 lumens. I think I’ll mount it in a Defiant 3C… I used Coleman fuel to de-dome the LED. I removed the dome became it became damaged with the LED/heatsink toppled over face down onto a table when it was running at 3 amps. Burned a hole in the table and buggered the dome. Edit: changed the thread …