Curious... what is the metal ring on an XR-E for? Are there any benefits to removing it? How can you remove it?
ring on an XR-E
- Thread starter jabe1
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Marduke
Flashaholic
It's an integral part and cannot be removed.
R33E8
Newly Enlightened
I think its a reflector
I have read of it being removed, in the large thread about the task force 2c cree from lowes. Are these users doing irreparable damage? The ring appears to me to be used to focus the led outward, if so, removing it should gain in flood characteristics (adjusting, of course for the reflector). Am I assuming right?
The ring allows them something to mount the glass dome to. They seem to have shaped the inside to act as a reflector to eek out as much light as they could from the package. It can be removed but everything has to come with it. The glass dome and the optical gel, that sits between the glass dome and the LED die. You have to be VERY careful when doing this as you can rip off the bond wires. That said it is very doable. The lumens output will go down but since the apparent die size is smaller it will collimate better. Also expect a tint shift to the yellow/green after removing the dome. There are several accounts of this happening myself included.
Not even worth trying then... Thanks all.
dom
Enlightened
Ktronik made me a mag light with the ring removed -throws like an aspheric and also had a very useful flood at the same time without the spot being too annoying.
I think it would be worth doing.
I'll take some pix if you like.
Cheers
Dom
Pics would be great, as I'm very curious about the difference, thanks.
i removed the dome of a P4 for a magmod. and the results are better than with domw, because the reflector seems to catch more light, because the opening angle of the emitter goes up.
the result are a little less lumens but a far better throw
the result are a little less lumens but a far better throw
Isn't the dome also to protect the phosphor? I just want the ring removed, so it will act more like an SSC.
Sorry but it is not possible to remove just the ring and not the dome. What you want is the new XP-E or XP-C.
The increase in throw is from a combination of more light to the sides and the fact that the apparent die size decreases allowing for better collimation. By my estimation the decrease in die size is responsible for the bulk of the increase in throw and not the more Lambertian output caused by the lack of the "Cree ring" blocking light to the side .
dom
Enlightened
I don't know how more quickly the phosphor will degrade without the gel.
I'll take a beamshot tonight at about 40ft.At 10ft the spot is about 4" wide.
I think if the LED is centered really well with the reflector the spot will be smaller.
Cheers
Dom
dom
Enlightened
Here's the pix
About 100ft beam on the neighbors roof shining on their aerial
About 50ft to the garage door beam is around 2ft wide
Cheers
Dom
About 100ft beam on the neighbors roof shining on their aerial
About 50ft to the garage door beam is around 2ft wide
Cheers
Dom
R33E8
Newly Enlightened
The phosphor is not mixed with silicone on Crees.
R33E8
Newly Enlightened
What is the phosphor mixed with? I thought phosphor was a powder...
dom
Enlightened
I just chopped a couple of rings off to see if any damage is done -seem to work fine still. I even stuck one of the ring/domes assemblies back on with some Loctite(non-fume type) hehe. Got my original tint back.
Just have to get a some fine sidecutters under the ring and gently squeeze. The ring and lens/silicone come off all together.Doesn't/didn't damage the P4 or Q2 i did it on.
Cheers
Dom
