dome of Cree XR-E broke off

[rayman]

I really have no idea how this could happen but the dome of a Cree XR-E on the Terralux dropin broke off. How could this happen?

Under the dome there is some kind of jelly. Anybody know what this is.

Is it possible to use the Cree emitter anymore?

rayman

 

[Cydonia]

Maybe high heat build up weakens the bond and allows the dome to come off when stressed? That is a MiniMag drop in right... twisting the bezel/head down to turn off the light might have contacted the led dome and broken it off. I find that this nearly happenes on the TerraLux drop in I have. Plastic reflector comes too close to the led for comfort.

 

[gillestugan]

the jelly is optical silicone used to bond the lens to the chip and encapsulate it.
You will not be able to repair it to what is was, sorry.

 

[rayman]

@Cydonia
Yes, I think you're right. I used a Cree optic and by turning off the MiniMag with the head the optic crushed down the dome and broke it off :(.

@gillestugan
I know :(. But I'll just use it without the dome as it is only a backup backup backup light ;).

rayman

 

[LukeA]

@Cydonia
Yes, I think you're right. I used a Cree optic and by turning off the MiniMag with the head the optic crushed down the dome and broke it off :(.

You can prevent it happening again by cutting the rim off of the optic holder (making the holder of smaller diameter than the optic) and snapping that onto the LED. It doesn't interfere with the optic's function, it protects the LED, and it ensures correct optic placement.

 

[trout]

I was going to ask the same question only for a MCE The dome got broken off due to hamfistedness.

It still works . can I put it back on with silicon or something

I know it will be substandard output
but what have I got to lose .

 

[TONY M]

:ohgeez:Oh no, I hate hearing about cree domes getting knocked off. NEVER touch the dome, the only good to come out of this is that it will never happen to you again now that you know not to touch it. :thumbsup:

I'm afraid that the cree's days are over, and you can not fix it properly... :mecry:

Have a nice day.

 

[Bullzeyebill]

:ohgeez:Oh no, I hate hearing about cree domes getting knocked off. NEVER touch the dome, the only good to come out of this is that it will never happen to you again now that you know not to touch it. :thumbsup:

I'm afraid that the cree's days are over, and you can not fix it properly... :mecry:

Have a nice day.

Yeah, happened to me too, playing around with an optic, and my Cree P4. Knocked off the dome. It can not be replaced correctly, and running it without it presents a really crappy beam.

Bill

 

[trout]

:ohgeez:Oh no, I hate hearing about cree domes getting knocked off. NEVER touch the dome, the only good to come out of this is that it will never happen to you again now that you know not to touch it. :thumbsup:

I'm afraid that the cree's days are over, and you can not fix it properly... :mecry:

Have a nice day.

ok so I cannot fix it properly
but what is the result if I put it back on with clear silicon

 

[Bullzeyebill]

ok so I cannot fix it properly
but what is the result if I put it back on with clear silicon

Try it, no harm can come of it, and report back.

Bill

 

[trout]

Try it, no harm can come of it, and report back.

Bill

Ok I have done it and restuck the dome with clear silicon
it is on and works . dont know for how long it will stay on and work though.


this is a mce from the same bin dome untouched and the one on the right is the fixed one the same optic was used for each shot and the camera setting fixed also

tha tapes are 1 mtre long and 2 metres away

 

[Bullzeyebill]

Looks ok. What are your thoughts looking at it in person?

Bill

 

[wildstar87]

I had some luck with Superglue. I scraped off a bit on the rim of the metal part, then put some Superglue on the rim, then put the dome down onto it, you have to keep it pressed down for a bit, but it seemed to work, there are still some artifacts in the silicone, but other than that it has worked ok.

 

[1 what]

Hi Rayman.
Welcome to the Cree XRE Dedomers Brotherhood.
I did a similar thing to a (non teralux) Cree about a year ago.
It gave me a tighter spot using a DX reflector and the Cree is still working.
Probably not a good thing to do on a regular basis since I've been told you can easily damage connecting wires in the Cree.

 

[DonShock]

I had good luck reattaching one with clear 2-ton epoxy. After mixing it up, I spread a thin layer out on a paper plate and then used some tweezers to dip the bottom of the dome in the epoxy before setting it in place.

 

[Illum]

some brands of superglue may dry up as opaque so I'd recommend using some off source and see if they don't.
Not sure about the heat, but I'm willing to give a dab from the cold glue gun to see if it domes:ohgeez:

 

[Superdave]

stick it back on and put a few dabs of superglue around the dome. It'll be fine. ;)

 

[Fallingwater]

How does the beam behave without the dome? I'm thinking it should be floodier as the dome acts as a lens. Am I right?

 

[starburst]

I had good luck reattaching one with clear 2-ton epoxy. After mixing it up, I spread a thin layer out on a paper plate and then used some tweezers to dip the bottom of the dome in the epoxy before setting it in place.

Same here, but mine was a rebel its not exactly the same tint as the
other three ( flood light with 4 rebels ) but I have to look over in the
edge of the light to tell which one it was. At least its not royal blue
now like without the dome.

Starburst,

 

[DonShock]

How does the beam behave without the dome? I'm thinking it should be floodier as the dome acts as a lens. Am I right?

Mine was installed in a quad-cree light running at 1A. After the dome popped off, that LED was very dim while the others remained at full brightness. As soon as the dome was glued back on, you couldn't see any difference in brightness between the untouched LEDs and the repaired one.