Which heatsink has more mass for the P7?

[AlexGT]

Britelumens or HA22? I intend to run a D bin P7 at 3 amps on a C size Mag and I want the most mass for heat dissipation.

Britelumens heatsink

HA22 heatsink

Anyone have tried both and want to comment?

AlexGT

 

[wquiles]

It matters, but not a huge much. Once the heat of the LED is transfered to the heatsink, the heat has to be transferred to the body of the light, and then to the surrounding air or the blood in your hands. In the end, the key is to remove heat away from the whole flashlight, and if you are running the P7 too hard, you will get fewer lumens because it will get too hot - no heatsink internal to the flashlight will make a huge difference then, as the weak transfer point is the flashlight to air/hand part

 

[mitch79]

Britelumens new P7 "C" Mag heatsink would be the longest and have the most mass.

 

[AlexGT]

Wow! that looks like one big heatsink! Thanks for sharing Mitch! I will look into it.

AlexGT

Britelumens new P7 "C" Mag heatsink would be the longest and have the most mass.

 

[mitch79]

From here.

Can you please post a pic of the underside of the C heatsink? and can you please tell me how far into the Mag tube it goes.

Thanks!
AlexGT

Alex, I have one of these heatsinks in my C Mag.
The base of the HS is flat, there is no recess.
From memory the bearing surface that extends into the body is 1" deep. I'm not 100% on that unless I disassemble my light.
There is sufficient space for a driver left.
I'm using KD's 3 mode P7 driver and it all fits together fine.

 

[AlexGT]

Thanks again Mitch!

I was just looking at that driver, and apparently is just what I am looking for, I want to use 2 x C li-ions for my setup, does your driver get 3 amps on 100% any problems with it?

Thanks again!

AlexGT

 

[mitch79]

Yes, I had issues with the driver overheating. I changed the diodes and it's all good. See my replies in this thread.

I'm running the same setup as your planning. 2C mag with 2x 18650 using downloads 2C Mag kit.

Cheers,

Mitch.