Did a simple test using an XHP70.2 (5700k) on an A037 lens with RLT collar.
Running at 12 amps (6v XHP70.2) and shaved dome.
Compared to having a Black Flat in it, these are my thoughts.
More lumens means the beam immediately exiting the flashlight is brighter, however lower intensity means that it becomes less bright soon after and just spreads out.
Looks kinda ugly how it turns into a big square so quickly, and with the cross in the middle being very visible.
Very bad yellow tint around the edges is amplified even more by the RLT collar. Would have preferred cool white (6000k+), but even then it wouldn’t fix the yellow edges.
Still easily lights up a big area 1km away, but the beam just isn’t very pretty. With an A380 longer focal length lens it made the beam a bit nicer and more tight/cylindrical.
.
Overall I don’t recommend using an XHP70.2 with any lenses or collars.
Why is there so much spill with the collar and aspheric lens? I thought that should eliminate all spill. Also, were you able to optimize the focus for the aspheric and RLT setup? The throw doesn’t look that impressive. Doesn’t even seem like it would out throw a stock TN42.
But thanks for showing us your work. It’s very interesting nonetheless.
It’s 8000 lumens, plenty of light leaking out and reflecting on the inside of the tube, passing through the collar, etc.
That all turns into spill.
The light is as focused as possible, although the collar is maybe slightly off from ideal.
The whole die covered in yellow phosphor and also the leftover shaved dome made it very difficult to focus the collar. but I think I got it pretty close.
In this config it probably has between 1 and 2 MCD.
It definitely does outthrow a TN42, I just didn’t take any pics of it shining at 1km.
The boats are at most 500m.
Enderman, have you experimented with slicing? I suspect a domed emitter would work better with a collar but I’m far from sure and I wonder if it has been tried…
The dome was sliced, but none of the phosphor removed.
Also a collar will not work well with a domed LED.
The dome of an LED reduces the intensity and a collar needs to reflect light off of the die, with no refraction.
If the LED (actually its dome) was a point source, refraction back and forth would be the same. It shouldn’t hurt when the dome is much smaller than the collar - and improved extraction is a plus.
Overall it seems to me that slicing and adding a collar do the same thing but collar does it in a more efficient way - because it’s more selective.
The dome makes the apparent area of the LED LES much larger.
This means lower intensity.
A collar will still increase the intensity but it will not be as much and it will not be a clean/sharp die projection on top of the original die.
