OSRAM CSLNM1.TG & CULNM1.TG 1mm², CSLPM1.TG & CULPM1.TG 2mm²

Installed the 2mm white flat into my L21A and get 1.35km at 1200 lumens ANSI. That’s impressive

Are you sure about the reflector size relationship between the m1 and m2? I was always under the impression they were much closer in ID/effective area…

Pretty sure JaredM, check my latest post in the Convoy thread.

I measure 25.6mm internal diameter for my M2. I believe the M1 is ~1mm larger. So that would mean about ~7% more area. Could you take an internal diameter measurement of the M1 please?

Nice results!
I have a L21A with 2mm as well.
How is your focusing and what driver did you use?

JaredM my calculations are based on reflector surface, which is proportional to r² or d² times height. This is where the 80+ish figure comes from (M2 reflector surface area divided between M1 reflector surface area). Reflector diameter and height figures taken from the Convoy store M1 & M2 reflectors' advertisement.

Barkuti, you mean r^2 or d

If I’m understanding you correctly, that is not the correct way to calculate the reflector area. It’s not the actual reflective surface area we care about, it’s the frontal area; the area apparent to a viewer far away looking straight into the beam. It is A=(pi/4)(D^2-d^2) where D is the large diameter and d is the diameter of the inner circle around the emitter that is not part of the parabaloid. Basically just subtracting the small circle area from the larger circle area.

I didn't mean to calculate the reflector area, I meant to have an idea of the relative area of both. That's it.

A = (π / 4)(D² - d²), EasyB? This cannot be right, in my honest opinion. If it were so, I could make a flat reflector (without height) and it would work fine throw wise. Reflector height and shape matters too, we know. Therefore, you may want to add height somewhere in that equation (???).

The shape of both reflectors is also a little bit different, although overall close. Even considering this EasyB's simplified equation could show some close comparative value here. Using EasyB's equation, the M2's area versus M1 is 81.706% (considering ∅31.8mm and ∅28.9mm M1 and M2 reflector diameters, and ∅7mm hole for both). This is to be expected, it is just missing a multiplication by the M2/M1 reflector height quotient to obtain the 81.169% number I got.

But well, once I build my M2 we'll better know.

What matters is the frontal area of the parabaloid, assuming the LED is in focus, so when looking into the reflector you see it filled up with the image of yellow phosphor. The flat reflector you mention would not focus the light from the LED so you would not count it as effective area.

Consider just a flat domeless LED. It has a fixed area, say 2mm^2. Now imagine looking at it from the side so you only see a very small sliver of brightness. The light intensity at that viewing point is very low because the area of the LED apparent from that perspective is very low. The same concept applies with the reflector; just the apparent area matters.

Also the numbers you’re using for the diameters for the M2/M1 reflector are the outer diameters I think, not the diameter of the reflecting area. See here for measurements.

Technically yes you can make a reflector without height, called a flat mirror, however the focal point would be at infinity so your LED would have to be inifitely far away.
You can make a shallow recoil reflector, with very little depth, and as long as the LED is at the focal point yes it would throw the same distance as a deep reflector with the saame front area.
Play around with the Reflectors #1 and #2 changing their diameter and focal distance, you will see how the parabola changes shape.

While the depth of the reflector changes how many lumens are collected, the frontal area is what determines throw.

Thanks for the contributions. I just took naked eye caliper measurements of the outer diameter of M1 and M2 reflectors looking right in front of my M1 and my M2 host: ≈27.6mm for the M1, and ≈25.4mm for the M2. Substracting the area of a ∅7mm hole in both cases, the M2 reflector front surface area is ≈83.641% that of the M1.

Can someone please confirm if 7.3A using the CSLPM1.TG 2mm version is safe?

These are lights I’m selling so they need to be reliable

7,3A for the 2mm is perfect,

Quote from the first post:

I also had opportunity to play with this larger 2mm white flat maybe even sooner than Led4Power. So this is mine pre- test with classic light meter and clamp meter (so test is just for reference before someone with better equipment test it). Full Samsung INR 30 Q. Single cell 18650 light with FET Djozz driver.

4.2V, 13.4A, 930 FC

4.0V, 12.5A, 950 FC

3.9V, 11.4A,1050 FC

3.8V, 10A, 1250 FC

3.7V, 9.20A, 1200 FC

3.6V, 8.20A, 1150 FC

3.4V, 7A , 1100 FC

Somewhere at 8-9A will be just enough…

I once used ≈8.1+A (measured effective) for the CSLPM1.TG (2mm²) in a Sofirn C8S, and it worked fine. Driver used: ∅17/22mm weird ramping SST-40 driver with additional R050 on top of the stock R005.

A max at 10A is not what I found in my test (graph also in the first post), but rather at 7.5A. So you are driving the led at its maximum output, provided that the heat path in your build is good, or else you are already over the top. My advice, for flashlights to be sold, is to aim for 6A instead, you are at over 90% of max there and the led is stressed a bit less.

Thanks for the measurements Barkuti! Didn’t know there was a full 2+ mm difference between the two… I think I still prefer the M2 for it’s thin bezels and size/throw efficiency.

I would love to see an 18650 version of the GT Micro… same bezel diameter as the M1 with 10% more reflector area.

Actual measurements are in link above. Also emitter hole is 7mm but the non reflecting area for the purpose of this calculation has more like 10mm diameter. So with those numbers M1 has 494mm^2 and M2 has 461mm^2.

Tried it at 6.3A using a Telsa 4800mAh 21700 and get more lumens than at 7.3A. Maybe I got a lower bin and 7.3A was over driving it.

7.3A - Samsung 40T

Turn On - 1200
30 Sec - 1170

6.3A - Tesla

Turn On - 1260
30 Sec - 1200

7.5 min before it’s too hot to hold

I purchased mine from Kaidomain

Is it normal for these to tint shift?

I get a slight purple even at 4.5A