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

This is what was literally explained in the beginning of this post I linked already.

You need to take into account area because there is more surface area on a hemisphere at larger angles.
A lux meter used to measure the intensity on the datasheet is kept at a constant 1m distance from the LED.
So the total luminous flux output of the LED is the integral of the candela over the whole hemisphere.

When flattened to 2d the result is the lobes graph:

Then you can take the area of one portion of the lobe to determine the fraction of lumens collected or lost.

Here, have this, it makes calculating what % of light you collect easy:

yes 2x26650

I will have for the 1mm ² a CC FET soon,
maybe can drive at 7A with proper board layout and special cooling layout adding 0.5mm copper sheet and fill tons of viases with solder as well

That refers to the CSLPM1.TG (2mm²) emitter, doesn't it?

What host are you speaking of here, Utorch UT02? 0,5mm copper sheet, is that for focusing?

Special cooling?

^:)

sized are planned for 20,22 and 30mm, possibly also 17mm
for high current on CC FET regulation a proper heatsinking is needed, so I am massively enhancing the PCBs thermal properties with solder filled viases and copper sheet,
if there is enough interest and prototypes tested I may produce a 2 layer MCPCB driver (PCB cost for that is very high about 200$ for a bout 100 drivers)
I am not planning on using MOSLED for the FET cooling as this should work in as many hosts as possible

The surface area of said spherical cone comprises about 13.4% of the total surface area of the hemisphere, yet accounts for ~25% of the light. So ~75% of the light comes from the remaining ~86.6%. So if we “weighed” the luminous intensity coming from said 60 deg. cone, which is between .9-1 relative luminous intensity (I’ll guesstimate on average .96 at any point on that surface) and multiply that by .134 I get a result of .1286. Guesstimating the average luminous intensity of the remainder, using a typical chart, between 0 and .9, I’d say about .6. So multiplying .6 by .866 gives me .5196, which is just about 4 times the result I got from the top section. I’m sure the actual equation is a bit more complicated than this (and I hadn’t done calculus or differential equations in about 26 years) but intuitively it seems to jibe now.

It also makes sense why an RLT collar at 33% efficiency would potentially double the luminous intensity of the light coming out its aperture (given a 30 deg. half angle aperture).

While impractical, it also seems clear to me that given a luminous intensity chart for a given LED, there would be an optimal aperture angle for the RLT factoring in the luminous intensity graph, meaning there is an ideal focal length (ratio).

Of course now for a reflector, even a precision electroformed one with the most reflective coating is only approaching 90% efficiency, so that boosts the percentage of light from said 60 deg. cone to about 27% of total light output, and likely more given a typical flashlight reflector. Which makes me ponder that there is an “equilibrium angle” where the light coming from the top cone is equal to that of the lower section with the included efficiency factor. Not clear to me yet what use this would be of, but it should generate the most OTF lumens.

It’s just integration, it’s easy.

2) there is no optimal aperture, the more light that a wavien collar collects the less lumens are output and the more intense the light becomes.
For highest efficiency you use no collar, for highest candela/mm^2 you use a collar that covers almost 100% of the hemisphere.
60 degree opening was just chosen as a good middle ground by wavien.

3) silver coatings are 98, aluminum 90-95, and dielectric coatings can get to 99+

4) the highest OTF lumens are with a mule and no optic. For even highest efficiency, remove the front protection lens too, that will get another 1-3% light output.

1. I should pull out my old textbook… Just don’t have it in me right now.

2. There would be a aperture that gave the most output given a specific emitter. Basically best blend of distance and throw.

3. Yes I’m aware but those coatings are not typically used due to their fragiity. The “standard” coating with a good durability is rhodium which I believe is at around 90%. I’m sure the cast and milled ones we use typically are not as efficient.

4. Yes but we don’t buy White Flats to make mules…

Rhodium has around 75% reflectivity in the visible range.
Dichroic coated glass reflectors have the highest reflectivity. This is what Wavien used.

Yeah, the only people using rhodium are the guys that make short arc flashlights because the UV degrades other coatings.
Protected aluminum is the standard coating for non-lamp applications, that’s what I bought.

Rhodium is also good if you like to clean you reflector with a cloth (for whatever reason) because it’s rather hard. You still need to be careful though.

Looks like Mountain Electronics has some Osram Flat White spacers for sale now. Still plan to buy Hoop’s because his are going to come with shim stock for adjusting the beam profile. Mountain Electronics may get me by for a while.

Heads up, the c8 style 30-30 gaskets I grabbed from mountain are for the smaller reflector hole. Like on the c8 op reflector. Wasn’t able to use them as is.

194kcd with CSLPM1.TG in a C8 driven at 7.5A with LD-4A driver.

Interesting result. Almost the same as my C8 with black flat in that made 196kcd but with noticeable bigger hotspot.

CSLPM1.TG / Black flat

But you weren’t driving the black flat at 7.5A were you?

So that is also double the lumens, so 1300-ish? Nice!

In the meantime I wished for a 5000K version of the NM1 and the PM1. I plan to use the NM1 in the GT-micro but I’m also contemplating giving in a few lumens by using a dedomed XP-G2 S4 3D instead.

The black flat is driven at about 4.5-5A with full VTC6. I must say that this led gave me nightmares focusing it and i am not even sure that it is perfectly focused but its the best result ive got so far and decided that 196kcd is enough.

I must add that the black flat is soldered by me on a 3535 board and the PM1 is on 3030 board bought from Led4Power. So almost certainly i lose performance on the black flat just because of my unprofessional soldering job with the black flat :smiley:

Should be close to double lumens for sure, at least from what ive seen from few tests here including yours.

5000k would be nice but i do not mind CW leds so its fine for me. I am not familiar with the micro GT other than seeing it on pictures but i had have dedomed S3 3D and it was very nice warm tint with no green hue whatsoever, it might be nice if you want warmer tint compared to the NM1.

Need some explanation from someone more intelligent than myself. I installed a 2mm2 Osram in a Cometa and when I was on max power the light dropped to the lowest setting within 5 seconds. Can someone explain what is happening? Put the XPL-HI back in it and it was fine.

Quick guess - Cometa has a low temp threshold, and the Osram is lower Vf than a XPL HI, so, the amps goes way up - probably too much for the LED anyway, and therefore the heat jumps way up fast, tripping the temp threshold which the XPL HI either can't do or takes longer to do.

Other guess: I have had problems with the 2mm white flat in combination with FET+7135 drivers (like in the Cometa). Perhaps it has something to do with the extreme low voltage (lower than any white led before). It may even have killed the 7135 chip but that may also have been accidental.