Another Weak Spot of the P60 Modules Design

[kosPap]

Electrical Contact Resistance...

Obviously it is critical in high drain applications, and pressure is the key to increased performance.

Here is a test I made. I hooked up a homemade MC-E Dropin that has a driver that DDs on high.

Measurements
Drop-in Alone = 1230 Lux at my lightbox
Drop-in and Bezel = 850 Lux (that must be influenced by a loss of spill by theebzel)
Drop-in and Body = 735 Lux
Drop-in, body & Switch = 635 Lux

Then I tested the dropin in the Surefire adding 2 revolutions of drop-in outer spring (in the surefire host you cannot use the oute ring)

Drop-in and Body = 940 lux
Drop-in, body & Switch = 775 Lux
(the dropin has a short pill and battery column space was further increased by thea ddition of the outer spring)

The same dropin – some time ago - was DD. At that time I was emasuring 3.3 Adraw in the Surefire and 4.4 A standalone….

Resistance. It’s a killer…

 

[kramer5150]

On my Direct drive MCE I have had problems with the small +B spring, depending on how hard its compressed, it will draw more or less current. I replaced it with brass bar stock, and now the module draws a very consistent 2.6A from any of my non-IMR cells.

Unfortunately this mod does not work with the moddoo low resistance twisty tailcap. That mod needs a spring at +B.

 

[kosPap]

I am in the process of replacing all my +B spring taht are on the soft side (like the derrelight ones)

If you want real power get those switches from DX that have a long spring.....(not teh "golden" one.