I was reading a review of some Fenix light in which the poster had included many nice photos. I couldn't help but notice machining rings running all throughout the inside of the reflector that is supposed to be smooth. Could these be contributing to the rings we are seeing or the rings are there regardless?
Cree rings: bad reflector finish?
- Thread starter pilou
- Start date
Help Support Candle Power Flashlight Forum
VidPro
Flashlight Enthusiast
the cree itself has this metal ring around it, that blocks and reflects light different than some other led domes, that and the light going out the side of the emitter goes through more yellow filtered phosphors.
so with the block, the reflection, and the filtration, the "rings" are comming right out of the initial light emitting device, they are then concentrated differentally in various optics reflectors and lens things.
i seen that ridging on some of the lights, it could certanly contribute to some waves of ringing, but the brunt of what i see in the beam shots is inherant to the cree itself.
Also
some reflectors for luxens would just be a Mess with the cree, especially the totally smooth ones. lots of cree reflectors i have seen applied, have some sort of "diffusion" on the reflector, stippling, orange peel, texture, or whatever they want to call it.
so with the block, the reflection, and the filtration, the "rings" are comming right out of the initial light emitting device, they are then concentrated differentally in various optics reflectors and lens things.
i seen that ridging on some of the lights, it could certanly contribute to some waves of ringing, but the brunt of what i see in the beam shots is inherant to the cree itself.
Also
some reflectors for luxens would just be a Mess with the cree, especially the totally smooth ones. lots of cree reflectors i have seen applied, have some sort of "diffusion" on the reflector, stippling, orange peel, texture, or whatever they want to call it.
Last edited:
MacTech
Enlightened
My Lighthound Cree drop-in in my SF 6P has a perfect, ringless "SureFire" style beam pattern, no rings, nothing
i also think it's all in the reflector construction/finish, the LH drop-in has a flat bottom around the emitter itself and a LOP finish
i also think it's all in the reflector construction/finish, the LH drop-in has a flat bottom around the emitter itself and a LOP finish
That's not the reflector's fault, that's caused by the LED itself.
Let's take a look at a picture form cree's pdf of XLamp 7090 XR-E.
We can see there are two small jump at about 90 degree, this causes the ring.
And how about Lumileds?
Of course this problem can be fixed by a special designed reflector, but it really won't mind you in daily usage, so I think you don't need to pay too much attention on this problem.
Let's take a look at a picture form cree's pdf of XLamp 7090 XR-E.
We can see there are two small jump at about 90 degree, this causes the ring.
And how about Lumileds?
Of course this problem can be fixed by a special designed reflector, but it really won't mind you in daily usage, so I think you don't need to pay too much attention on this problem.
Nereus
Enlightened
Fineday, I came exactly to the same conclusion some time ago, see this thread: https://www.candlepowerforums.com/threads/145652 . Unfortunately I have no Crees lying around so that I could test the theory... 
-N
-N
