Wurkkos TS21 with Nichia 219c 5000k - perfect "daylight neutral tint"? Impression & comparison w/ other high CRI LED's

cannga · September 30, 2022, 2:43pm

QReciprocity42:

cannga:

hanks. At the least Simon’s 9.4 mA is way off no? 9.4mA x 7 x 24 = 1579 mAh per week - is my math correct? Most definitely my Convoys don’t go into LVP mode for at least a couple of months, let alone 3-4 weeks. That 9.4 mA spec is actually the reason I included Convoy in this comparsion - it has bothered me. Yeah perhaps I should ask him to clarify.

Your math is correct, and I’m inclined to believe that Simon’s numbers are way off. The only conceivable reason the numbers might possibly be right is that there might be some driver/switch combination that drives the tailcap really hard, perhaps to counter light loss from a metal switch (as opposed to silicone). But I don’t see any evidence that such a combination exists.

I think it is a good idea to ask for a clarification. 9.4mA looks really bad, it’s more current than the 0.1% mode on his 5A driver, which consumes 8mA at full battery.

Simon re-confirmed it is 9.4 mA. But check this very interesting discussion :

bitew:

cannga:

bitew:

cannga:

Thank you. I re-measured with full 4.16v battery and still only see 0.7 to 1 mA, with 3 lights S21Dx2 and M21B. How I measured: rear cap off, one probe on negative end of battery, other probe clamped to spring, then touch edge of cap to edge of battery tube and measure when blue LED is on. Did I do this correctly?

To double check, I had also set aside a S21D for 3 weeks (and a bunch other lights) and the result was min voltage drop in S21D’s battery, and consistent with a 1 mA drain.

Just Google checked: other people got high parasitic drain like yours, but someone on Reddit had same observation as mine - light went for weeks and very little voltage drop. Strange.

Ah… I measured directly with a power supply at the button board.

Now, I checked both my M21B and S21D and you’re right, measured at the tube with the battery it’s below 1mA.

I think what we see is the added resistance of the driver board.

Thank you! I am fairly OCD about testing and being the sole person who got 1 ma was driving me a little nuts. :person_facepalming: :innocent: A couple more questions please:

1. So which method is “right,” or rather, more indicative of actual condition? Mine, or yours (power supply at button board)?

2. I mentioned I had left S21D for 3 weeks and measured voltage drop as a result of the blue light switch (I know not linear, but just want a rough confirmation) and the result does not support a 9 mA parasitic drain of S21D at all (I plan to redo this test to make sure I didn’t screw up). Any comment or explanation from anyone on this “mystery” of Convoy blue light switch please?
Anduril Dim Button (~100 µA drain measured): 0.079 volt
Anduril Bright Button (~1.5 mA drain measured): 0.164 v
Convoy S21D Blue Metal Button (4.1v: 9.4 mA , at 3v: 2.74 mA): 0.067 v

Your method is correct for the specific driver.

The button has only resistors and leds, it’s basic Ohm’s law and the specifications on AliExpress are correct, considering the leds forward voltage and the 300 ohms resistors.

When installed you are adding additional (unknown… depending on the driver? I really don’t know much about drivers… and far from expert in electronics) resistance to the circuit.

Still, the specifications on AliExpress are fine, maybe it should be noted that the actual drain depends on the flashlight used.