Yes it would increase the intensity, but my point is that you can get a bigger performance boost by using a different type of main optic when using a collar
Another problem (I made the same drawing a few years ago :party: ) is that in order to prevent blocking the reflected light from the reflector, the mirror must be small and close to the led, so with short focal length, resulting in a larger reflected image than you want (unfortunately the led die is not infinitely small so the projection is an image, not a point), I assume larger than the die you want to project it back on.
Edit: no, it must be just as large since the source distance is the same as the projection distance. I guess??
For wavien collars it doesnât seem to matter much which size you use (if the LED is small). The luminance gain is almost the same (the small one is more difficult to focus though).
I finally remembered to calculate this. It was easier than I thought, all you need is Pythagorasâs theorem for triangles since I already now the diameter of the reflector and the maximum focal length (94mm).
So the depth of the reflector is 73.2mm (distance from lens to focal point, straight down).
The real depth all the way to the bottom I donât know yet, maybe an additional 15mm.
So, who is going to put a Black Flat into his BLF GT to try to beat this light?
sma tested the Osram Q8WP here (a source in China has surfaced) and unfortunately two of his only reached 190-206cd/mm^2 (same as the old XP-G2 R5/S2). It seems they are of the lowest possible Bin and thus very inefficient.
There is a different Osram LED though which has a higher luminance than the Osram Black Flat, the Osram Synios P2720 DMLN31.SG. This test showed that it can produce up to 297.8cd/mm^2, which is 20% more than the Black Flat. It's downside is that it only produces 200 lumens and the small Die creates a tiny spot (0.225mm^2). I think it's too small and dim for this light though. The Black Flat itself is rather dim...
Be more creative ;). https://www.yoycart.com/Product/547738518217/
Yoycart is a Taobao agent who has an English website showing which products he offers. This makes it much easier compared to buying on Taobao directly (only Chinese).
Huh, interesting.
How do we know that itâs not an old Q9WP being sold as Q8WP?
If no reputable distributor like mouser or digikey have it, why would this site have it? https://octopart.com/search?q=UW+Q8WP
EDIT- I just found it available here actually, must have recently become available
Yeah, RS has the NAPA bin in stock, also the lowest, but whatâs interesting is that there is a âV2â version which is rated for 6000mA rather than the default 1400mA, even though it shows the same lumen values.
Maybe they just used the default lumen value from the datasheet but the LED can handle higher currents?
If they get some in stock I might buy one of each and compare them, but they will arrive in de cember so maybe by then we can find NBPB or higher bins.
They donât mention âV2â in the datasheet. RS has a new version of the datasheet for the V2 though, datasheet version 1.1.
There are a few differences. They removed the lowest Bin âNAâ and added a new top bin âPBâ. The maximum constant current ist still 5A (6A is for pulsed operation). There is also an example product code, where they used to list NA and now list the NB Bin. So I would guess that these new ones will be in NB Bin.
The problem here is that this isnât enough. You will need at least the PA Bin to get any real benefit with this LED.
Generally itâs very obvious that RS doesnât do a good job of putting the real specifications into their database. The first Q8WP LEDs are specified as âthrough holeâ components. :person_facepalming:
NAPA means it will be either NA, NB, or PA.
No idea which bin youâll end up getting when you purchase, since they just list the range of possible bins.
The only way to be certain youâre getting a high bin is to wait a loooong time until some places start selling PAPB or PBPB.