As mentioned previously in other threads I am planning a major srk mod. I decided to work on the 4 emitter light which will receive the 32x 7135 srk driver and a slave board with 10x 7135. This mod plan includes a new head and thanks to a bit of brainstorming it will include an integrated shelf. Based on my rough calculations I’ll be able to piece together a nice deep compound reflector. Unfortunately it is proving to be a bit difficult to find anything suitable. I’m trying to find reflectors 48mm to 50mm in diameter and somewhere near 39mm tall. Kaidomain lists this but they’re sold out. Another alternative might be this but I can’t find dimensions. Anyone have suggestions for reflectors of suitable size?
Opinions about this one ? It’s a bit smaller at 41.6 x 36 but four combined into a compound reflector might provide good throw. Willing to sacrifice a bit of width but want to get as close on depth as possible.
I’ll keep looking but if I don’t find anything better by friday I’ll order the 41.6 x 36 Tiablo A9 reflectors linked to my previous post. The slightly smaller size would allow me to leave more material on the head and slightly deeper cooling fins. Powered by 4x 30Q with 15.96A to 4x u3 3d emitters it should punch a nice hole in the dark.
STAY AWAY FROM THAT ONE!!
Seriously. I have one that I bought to replace the stock UF C10 (deeper than C8) reflector that I fubared. I haven’t gotten a half decent beam from in with any led/spacer combo. Definitely not recommended. The one MRsDNF suggested on the other hand is one of my favorite reflectors I’ve bought. Works really well with XM and up size emitters.
I honestly considered that one but the listing states the depth is 27mm but the height is 34mm. If so, the width about 2x the depth would be very floody, wouldn’t it? I’m looking for something deep to help maximize throw.
Width is the by far the most important dimension of a reflector. It alone determines the minimum theoretical beam angle, while the depth (diameter staying the same) adds to the amount of emitted light that is focused into the hotspot. There is diminishing return with increasing reflector depth with respect to the increase in captured light.
My only concern at this point about the reflector recommended by MRsDNF is the seeming conflict in dimensions given. The size is stated as 50 x 34 and in the description it states width 50mm diameter 51mm height 34mm depth 27mm.
comfychair ordered the same one 3 year’s ago, the second reflector. 
He may still have it.
A few of These from Kaidomain should do the job and they seem to be in stock as well…bonus!
I’ve used the exact reflector Lampyris links to. I’ve done more than a bit of work to adjust emitter fit. That specific reflector was made for the Cree XRE emitter. I had to reduce the base thickness to get an XPG emitter to focus. Good luckl w/ your project.
I have a bunch of KD 47997, which is the same “SST-50” reflector that MRsDNF linked. Measuring one with Mitutoyo digital calipers I get 2.011”[51.08mm] in diameter, and a height of 1.18”[29.97mm].
Not sure how tall a mag rebel reflector is, but its ~52mm in diameter and pretty tall.
@Andrew2007 Thanks. I sent a pm to comfychair asking about the quality, beam, and accuracy of the stated size.
@Hoop What is the quality of the finish and beam? How does it do with xm-l2 emitters?
It makes a nice collimated beam with an xm-l2. The finish is good but there is probably going to be a dust spec or two. This doesn’t affect the beam.
Thanks to all. I will place an order for six of the sst-50 reflectors in the morning, four for cutting to make the compound reflector and two in case of a mistake.
I believe it was Toykeeper who suggested to coat the inside of the reflector with regular elmers glue which will protect it during cutting. After the cutting, the glue can be dissolved in water. I think it is worth trying. Maybe experiment on one reflector first. Elmers glue does tend to chip a bit, but there are somewhat rubbery formulations too. You’re going to want to avoid physically touching the reflector coating with anything, and rely on water and air to clean and dry it.
The LED mag reflectors, being so tall, would have a bit less spill than the SST-50 reflectors, but the SST-50 reflectors have been used for years and are well regarded. It will be a good thrower for sure.
At the last minute I decided to go with a smaller reflector to reduce the amount of material removed. I would have been cutting so much off of the 51mm reflectors that the assembly wouldn’t have been much better than one big reflector. I ordered some c8 reflectors from RMM which according to the usps should be here tuesday. I’ll only need to cut 7.5mm off of two edges on each reflector which would mean removing about 6.25mm of the reflector cone’s diameter and retaining a good portion of the material at the assembly’s center. The c8 may not have the greatest range but it’s a major increase in diameter compared to the original srk quad reflector and I have no doubt that a quad u3 array drawing 16A should provide enough output to reach a decent distance. Their shape will allow me to leave more aluminum in the head and a few deeper cooling fins.
C8 reflectors throw pretty darned good with dedomed XM/XPL emitters at least.
I’m leaning toward de-doming. Haven’t tried it yet but I’m seriously considering it.