Awesome upgrades Toykeeper! I’ll definitely order one soon. Likely from hank due to shipping costs.
… or instead of sacrificing the flashlight to save the user, maybe it could use regulation, thinner wires, or moderation so it doesn’t get scorching-hot in the first place? This way, it wouldn’t hurt the user or the flashlight.
If it’s too hot to touch, it’s probably too hot period. Incandescent lights may operate at 5000 actual Kelvin, so insulation is appropriate for those… but LEDs die faster the hotter they get.
I’ve never had an LED in a light die from too much heat. I tend to go on to the next LED light toy before that happens. As long as my LEDs aren’t getting so hot that the solder melts I’m fine.
I’m also not a programmer. In the DQG I was using a driver with moppydrv firmware with a programmable stepdown. Only problem was the stepdown only went to 50% FET, and in that light even 50% was too much for extended use. I either need a rampdown to 20% or I need a temp sensor.
On the upside, it looks like RMM may start selling drivers with the new firmware on them in different dimensions. So hopefully I can replace the drivers on all my old e-switch lights with drivers with your new v2 firmware 
Oh to be a fly on the wall inside your titanium supported brain!
I have to admit I was just contemplating a line of thought very close this.
Just got my S4 2B, and it does get dangerously hot. I took the optics out just to see how it would be as a mule and the end started smoking vigorously within 5 seconds. This flashlight doesn’t seem safe?
The LEDs’ circuit board is not glued or screwed to the shelf. The optic and lens press it against the shelf when the bezel is tightened down.
Removing the optic prevents the board from properly conducting heat through the shelf and into the body of the flashlight.
I hope your light is okay… 
It’s fine now, the domes aren’t cloudy or anything. It was more surprising than anything else. I do love the light, I just wish LEDs were more efficient here on the ragged edge of emitters in hotrods. Love the UI.
ok this emisar light need a proper exposure, i didn’t even know D4 before this thread. Now there is a thrower and a D7? I haven’t even got my D4
Yeah, without pressure holding the MCPCB against its heat sink shelf, it’ll cook itself pretty quickly. That’s normal. It shouldn’t be operated at high current with the heat sink nerfed.
(this also applies to wrapping the pill to make the surface feel less hot, though that has less immediate results)
D4’s MCPCB is 2mm thick, all other MCPCBs are 1.6mm, it is highly unadvisable to use a thinner MCPCB which will create issues with thermal transfer between the head and the MCPCB as the Bezel is holding down the MCPCB by pressing down on the optic.
Neither should the flashlight be used without the bezel and optics in place, doing otherwise will overheat the LEDs.
The D4 will produce tremendous heat on turbo mode, and heat up very fast (10~20 seconds for the thermal protection to kick in depends on the cell), please make sure the bezel always be tightly enough on D4 although it’s checked very well before leaving the warehouse.
Hi Hank,
do you know when the D4 will be available at intl-outdoor ?
Hank, why did you make this MCPCB thicker?
The price has been increased once again… :weary:
EDIT : ordered anyway, I’ve waited for such a compact e-switch flashlight too long… and with that FW I could not pass !
Ordered!!! Muahahahahaha!!! :smiling_imp:
Ordered.
Now the wait…
My bank has downtime, doesn’t accept card transactions now :rage:
Guys / gals, which one did you pick?
Black 219C
Grey 219C
Green 219C
Green 219C + 18350