Heat problems?

Hello everybody I am building a couple modded mag's in which I epoxy the circuit board to the ground down post in the switch and was wondering if I might have heat problems? I am using this driver 17mm 1000mAh 5-Mode with Mode-Memory LEDDriver Circuit Board for Cree XR-E Emitters (0.9~4.5V Input) . And also would 1Amp be to much for a P4?


3D black mag

That driver is fine for P4, apparently you could push the emitter even harder with appropriate heat sinking. I have used same driver for P4u2 to great effect.
I can't say heat build-up with 3D, but I have not felt any substantial heat build-up and subsequently decided to use mine in plastic cap (no heat sink).

i epoxied some mods , and regretted it. i like to "Pot" stuff with J&B weld, and insure excelent conduction for heat by locking stuff down, that would take a jackhammer to get it back out. and 3 months later everything changed, that sucked of course 5 years later it still works, with cruddy old leds in it.
i guess that was what the screw holes are for on the star mounted leds :ironic:

I doubt that there will be a heat problem. That driver board looks like your typical AMC7135-based board. If you drive your light using 1xLi-ion, the driver will run quite efficiently. The LDO regulator efficiency is roughly Vout/Vin (since quiescent current is essentially negligible). I've measured about 3.4V at 1000mA forward current to a P4. Thus, your driver efficiency might start out at 3.4/4.2 (81%), quickly go to a quasi steady-state 3.4/3.7 (92%), and finish at 3.4/3.5 (97%) before falling out of regulation. By then, the Li-ion will be mostly depleted anyway. Worst-case, at 81% efficiency, the driver is wasting only about 0.8W as heat.

Although the ideal is to provide separate heat sinking for the LED and the driver, a Mag mod heat sink is probably massive enough (plus it is in good thermal contact with the Mag tube for additional heat sinking) that you could use some thermal epoxy and pot the driver to the LED heat sink. Plus, the P4 is pulling only about 3.4W of power, of which about 2.7W is dissipated as waste heat. So that's a total of only about 3.5W max of waste heat to manage.

The high powered quad dies like the P7 and MC-E generate a lot more than that in waste heat.