KC1 keychain light is available now

It’s a boost driver that is more expensive.

Pray tell me which competitor is selling those cheap boost driver lights, asking for a friend :smiley:

Since video shows non calibrated thermal runtime, would you mind showing properly set themp settings runtime and output?

500lm seems to me too weak for this massive heatsink of flashlight...

It’s a 98 CRI LED, it is going to get relatively hot. I guess it’s going to fare better under a cold night out than in a lumen tube.

I have around 20pcs of B35AM and AR and they can sustain 1000lm without a sweat. Better find one and try so you’ll see how underpowered looks this initail video…

Hank's rating is 1400 lumens with the B35AM. Video shows 3.6 amps from a boost driver for a 6V LED, looks like 1650 at start, so maybe ~1500 at 30 secs. The light is 120 mm long, 40 mm head - nothing at all very big, think of it as a BLF/Eagle X6 but little shorter, or an Astrolux EC01 but slightly larger head diameter.

My immediate question is why limited to 3.6 A? Can the driver take 4 amps?

4A seems to be the absolute maximum on Eurekatronix’s high perf MCPCBs, 3.6A drive current sounds adequate to me.

In my builds B35Am at 6V/4A turns a lot rosier than realy is so it’s on a max driving limit. Sosetting it on 3.6A is very good idea. Only stepdown is a minus

check this Clemences reports:

Ohh - there's no neutral thermal pad, so I guess that's a limiting factor?

Ref: https://budgetlightforum.com/t/-/66345

Correct.

Cool! Sounds like the R&D has already been done on these LED's. Not clear from Hank's listing, but looks like the output binning varies based on the tint - lower tint, lower output. E700, E800, E900, E1200 shown in the store listing https://www.eurekatronix.com/product-page/nichia-b35ax?

So the 3500K is E700, 4000K is E800, 5000K is E900, etc.

Datasheet on the Nichia B35AM here: https://www.nichia.co.jp/specification/products/led_spec/NV4WB35AMT-E(5768D)R70%20R8000%20R9080.pdf

Page 4 has the lumens outputs at 1.4 amps. Hhmm, might have to re-consider 3500K. 4000K jumps up to the next output bin, roughly 200 lumens more I'm guessing for 3.6 amps.

Yeah, so choosing higher CCT should give you higher outputs at the given current. I guess…

Sounds good to me. I typically use lights like this for walking the trails at night, and I usually stick between 5-20 lumens. Just enough to see down the trail without ruining my night vision.

My current go-to is a D80v2 with 219b and a 2A max regulated driver. The B35AM 3500K will probably more than double the max output of my D80v2.

Kaidomain. I wouldn’t exactly call their $24 XHP35 C8 a serious competitor to the DM11 though.

I think a better question is what does compete with the DM11/B35A? Perhaps the Acebeam E70/FC40? That’s the same price. The Zebralight SC700d? That’s considerably more expensive.

“the light was calibrated but I did not adjust the thermal limit” - direct quote from the video

He did calibrate the temperature sensor. He just didn’t change the max temperature it can reach before stepping down. Those are two different settings.

I think this is the most relevant way to do a runtime test, since 45C is both the stock thermal setting, and a reasonable temperature to still be able to hold onto the light without gloves.

If you are interested, these are the bins of the B35A emitters from Hank:

NV4WB35AM sm273 E700
NV4WB35AM sm303 E700
NV4WB35AM sm353 E700
NV4WB35AM sm403 E800
NV4WB35AM sm453 E800
NV4WB35AM sm503 E900
NV4WB35AM sm573 E900

I know what he said but since FW3A release there was a strong recomendation to set 60deg max temp. If you run it at this low value then why going for this not so pocket friendly item. Convoy S21A with 6V/3A driver and B35Am fits better to your need and sleeps into the pocket real nice.

So i hope Wad will adjust those settings to more apropriate values for this big “mid range” thrower and so shy 45

Also the Convoy M21B, you can choose GT-FC40 (5000~5500K sold out now, 4000~4500K and 3000~3200K are still available) with the 12V/2.5A boost driver.

And the Convoy S12 (various 90CRI LH351D, or 219BT-V1 sw45k/sw35/sw30) with the 8A buck driver.

But these two drivers are both operated with a tail-switch and a biscotti-like UI, while DM11 is operated with a side-switch and the Anduril 2 UI.

Correct, higher CCT LED has less phosphor and lets more blue light through. Fluorescence isn’t nearly 100% efficient so the more excitation light is converted to longer wavelengths, the less light is output overall.

Aw shucks, too bad the 98 CRI isn’t mentioned in the options dropdown menu, I would gladly have paid the extra 20 USD for that. 95 is good too though.