It’s not weaker, but there’s less of it, otherwise you wouldn’t have those lobes, right?
It’s quite hard to put it into words… :person_facepalming:
But still, experimenting with a B158 lens on a SupWildFire suggest the lobes misrepresent reality…
So i don’t know.
But what strikes me every time this is discussed, is that the focal distances around that “magical” 45° is not taken into account.
In my experience a not so deep reflector makes a better thrower, because it’s a larger parabola size.
But obviously a very very short reflector will simply catch much less light to collimate.
I think the best proportions are between 3:4 and 1:1 (width : depth).
This is kinda going off topic since the thread is about LEDs, but the max intensity of the spot depends on front area.
That means that for a constant diameter, going deeper will increase the front area and therefore lux because the center circle diminishes in size.
A shallower reflector has a large dead center circle.
This has nothing to do with lobes or lumens, all that matters for throw is LED intensity and the front area.
Yes there are diminishing returns as you make a reflector deeper, but it still is an increase in area.
I made this thing years ago for the BLF GT: Parabola creator
Move the ‘h’ slider around and you will see how the front area changes.
Back on topic:
Enderman has found an active area of research into single-crystal phosphors.
These can be used with LEDs and laser diodes as well. Their primary advantage is better thermal conductivity and lower performance degradation when they are hot. “Hot” actually means as low as 60 Celsius. Our high-power LEDs have junction temperature way higher than that and phosphor is hotter still.
Here’s a nice summary of several research papers concentrating on laser use (in German).
There are already manufacturers of such phosphors. For example Crytur.
Disadvantages:
- cost, according to Endermann the price starts at several hundred USD. How about larger volume?
- tint high above black body line. Image from Crytur
I wonder how the phosphor crystals compare to the sintered phosphor that Osram uses.
The crystals have basically no drop in output till 300C
This means you can have a pretty intense laser directed at it without damage.
One university tested up to 14W of blue laser and got 4000lm but it was spread over a large 5mm crystal IIRC, not all in a concentrated spot.
The crystal was not heatsinked to anything either.
These are my main resources:
That doesn’t fully answer my question though ;).
Sorry that reply was for Agro.
I have no idea what type of phosphor osram uses or how it compares.
Probably a trade secret if I were to guess.
New (1mm2) king:
That’s the CSLNM1.TG right?
The newer and better black flat.
Where did you get it from?
I don’t see anyone selling fewer than 1000 except mouser which has none in stock…
https://octopart.com/search?q=KW%20CSLNM1.TG&start=0
So what led is that then?
(if Enderman is correct, Ostar Projection Compact, highest bin 1000 lumen @ 3A, Oslon footprint, neutral thermal pad)
Will you be selling these?
It is CSLNM1.TG, I will put them on sale in few hours. Better be fast because next batch could be in 2-3months, this is new LED so production is started just recently.
Vf is insanely low for 1mm2 die LED, 3.18V@3A and 3.40V @5A, 25C.
BLF member luminarium iaculator already tested this LED in real life vs best old XP-G2 S4 - it beats XP-G2 in throw, that's for sure.
will keep a check on your site! 
Is there a datasheet somewhere or link to test?
I presume he just drove the XPG2 at the same levels for 1:1 throw comparison. I wonder how the XPG2 would fare driving it up incrementally until it hit its limit at about 6 amps? Or to just cut to the chase, compare them when both are driven up.
Btw while on that topic do ya know about what’s the amp limit on this LED?
It comes on a copper DTP MCPCB correct?
Is it sold out already or am I too early?
I assume it is a bare led, and I have not seen it listed yet.
Well, in his pic above, led4power shows it on one of his L4P boards, so maybe it will be available already reflowed. I looked at his site and didn’t see it either.
Yeah it would be great if I can buy them already reflowed nicely