Heya, does that driver can actually go up to 4.6V maybe even 4.8V?, if so I’d like to use it to drive my NUBM08
Does anybody have a 3x21C with SFT40 and new driver? I was wondering how much candela it has…
I never measured the output voltage with the diode on the circuit, but with a battery at 3,6V I was getting a very low optical output from the 0F with the 7135 driver, while this driver keeps the output strong all the way until the battery dies, so it is boosting the voltage above the battery level, I’m just not sure of how much. I never disassembled it after it was finished. Note that the low mode is lower than the threshold current of the diode, it doesn’t produce coherent light at that drive current, you will only see a faint blue light coming out from it.
If I remember correctly the 08 I had on another host had a higher forward voltage than the 0F, so the results might change. The 08 has a nicer color than the 0F though so i’m saving it for a smaller host, I did little testing with it with this UV driver (it worked is all I can say, I’m not sure about the regulation stability and stuff).
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Ah, I see. Not the worse thing if it can’t drive the 08 to its max current, still usable so I’ll try it!
I see that the lowest mode is 5%, wish we can swap the mode.
I have some basic scope so I can poke around when testing it with mine, just wanted to be sure it can at least drive it.
Can’t find any info on what boost controller it use on that driver (kinda look like mp3431), but I could also try modding it if its not good enough.
Still need to de-lens my diode tho.
But thank you so much!
Hi @Simon_Mao
Can we get S26A in MAO finish by any chance?
Just saw this on the product page for the M26D, I hope this means Simon’s testing it with an LHP73B!
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Hi @Simon_Mao
Could you add pictures of the LMP LHP73B mounted on the 16mm, 20mm, and 25mm MCPCBs please?
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Has anyone tested the LHP531 at 20A?
Is LHP73B more efficient than XHP70.3 HI R70?
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Haven’t seen a test, but heuristics suggest yes. The LHP73B has a much larger light-emitting surface, which in turn lowers power density and raises efficiency at all input power levels. The only exception would be if Cree uses a more efficient phosphor or die, but it would need to be much, much more efficient per unit area in order to offset the difference in power density.
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20A is probably too high of a drive current for LHP531.
In comparison: a 6V XHP50.2 is maxxed out at 10A, which means its 3V counterpart would be maxxed out at 20A. Reaching maximum output means abysmal efficiency, which is undesirable and easily avoidable in a floody light. For 20A of drive current, the LHP73B is a more appropriate emitter.
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Probably but barely. From the official datasheet you can extimate it should produce 5000lm at about 6,2A and based on multiple output test of the XHP.70 by koef3 and others we can see that XHP70.3 needs about 7A to achieve the same brightness.
Depending on the input voltage, maybe. Someone correct me if I’m wrong, but as I understand 3v led is only more efficient at lower drive currents. This is why lower Vf leds get brighter with less power input. These large non homogenous LES emitters running at 3 volts need huge current input to get their max brightness (I’ve tested some to over 30 amps and something like 150-160 watts).
A 6v or 12v led like the xhp50.3 or xhp70.3 will be more efficient since the driver can better regulate the voltage/current and does at at a lower input current. The 6v xhp70.2 tested by Texas_Ace a while back reached 20 A and would have kept going. Cree’s CSP flip chip LEDs are very good. So far, China doesn’t have an answer to them.
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The original spring can withstand 10 amps of current each.
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There may be too much solder on individual LEDs. If this happens to you, you can use a knife-type soldering tip.
I haven’t received any official comment, and I think they have abandoned the plan.
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all of them
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The voltage of ultraviolet led is usually between 3.8 and 4.2 volts, which is different from that of ordinary white led. This requires a custom drive circuit.
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Few users are interested in s26a.