But it needs more current, I guess?
I’m thinking of a light with a separate LED for flood and perhaps another one for RGB output. I still have two XM-L RGBW LEDs lying around and a couple of spare S2+ reflectors. 3D printing added a lot of options.
I edited thread name and I added White Flat 1mm& White Flat 2mm aka OSRAM KW CSLNM1.TG (1mm2) & Osram KW CSLPM1.TG (2mm2) in first post of this thread. Both Djozz tests are in first post of thread.
So you got 110kcd at 4A in a C8 with the 2mm white flat. That doesn’t sound that good since 4.5A with a dedomed XPG2 will get around 170kcd.
I just did some measurements using a bench power supply on a 2mm white flat I got from mouser. The output peaked at 8.25A. In an EE X6 head I measured 109kcd at 6A. This beam intensity was a bit disappointing. The focus was good, so I can’t explain why it’s low.
Given the similar performances and prices, I would go for the new White Flat just to avoid any problem with grounding issues…
I put some black flats in my Emisar D1 and D1S, but some strange behaviors are to be expected :
when I wrap my hand on the D1, which is equipped with a SS clip (clipped) I have a faint glow on the LED if I put my thumb on the switch bezel the slight conductivity of the skin is enough to allow some low current between ground (via the clip) and the MCPCB…
That means that you can’t throw the light in a pocket full of keys/coins because it could power ON on direct drive…
The white flat is easy to use, with no short between thermal pad and cathode so I’ll now choose it for any thrower (aspheric first, of course)
Go with the white flat, it has a neutral thermal pad so you don’t need to worry about any insulation or other things.
Also Led4power sells them already reflowed onto MCPCBs so you don’t need to do it yourself and possibly end up with a bad reflow or dead LED.
The white flat is ideal for single cell lights with a linear driver.
A constant current driver though, DD drivers will kill them,
unless you use a crappy battery and / or crappy electrical path and STILL only have full output with a freshly charged cell…
Yes. I agree since all your mentioned variables must be prepared for FET DD setup but hey! Mine did not die yet (1 and 2mm version).
So linear drivers.
Do you remember these guys: Nanjg 105C, AK-47, Nanjg 101-AK-A1, Nanjg 105D etc… That is if you are on the budget.
Chips stacking art (AMC 7135/8 current regulators). That seems like forgotten art?
If you want the best there are L4P drivers, TA series and others…
In 17mm: LD-25 new version @ FastTech. Review by Henrik. Straight current adjustable. I'd ensure a good heath path for it, even to the point of copper heatsinking the MOSFET if raising current a lot.
In 20mm: LD-29 updated version @ FastTech. According to HKJ reviews (1st, 2nd) its sense voltage is 75mV (25mΩ sense resistor for 3A stock driving current). Accepts 1S and 2S input.
Well, I doubt that my measrurements are combarable only for myself… Maybe have to think little better way to do those.
But compared throw and it was pretty same than EmisarD1S, was hard to say which was better.
What's all of this C8 gossiping? Does this mean the white flats are not well suited for its reflector? Or WTF?
Dedomed XP-G2 at 4.5A does 170Kcd in a C8? How is that? As far as I know an XP-L HI at 6A will maybe do 90Kcd, doesn't it? It's hard for me to believe the XP-G2 doing that much better against the XP-L HI 5700K in a Sofirn C8T.
Throw is from the led /reflector size and led intensity/mm2 emitting surface. A dedomed XP-G2 has higher intensity/mm1 than XP-L HI. that is all.
See my measurement tables. You will find over 200 measurement and it has dedomed XP-G2 and osram white flats and etc.
My C8 with dedomed XP-G2 made 151,7 kcd from 850 lumens. The second best is 136 kcd with dedomed SST40 in a C8. but with 2000 lumens.
I wasn’t trying to start a competition about who’s C8 is the best. I’m just trying to understand each report of a measurement of this new LED so we can know it’s capabilities.
Of course comparison of different v people’s results is made difficult because of different measurement conditions and equipment.
… i.e. the hotspot of these leds in a reflector light is around 6000K, at which colour temperature all budget luxmeters read too much, think between 5% and 12%.