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1) Remove the top 4 screws on the head of the light. This will allow you to remove the stock optics.
2) The stock optics consists of a chrome reflector and a transparent "lens"
3) Once these are removed, you can remove two silver colored screws to separate the head from the battery holder (this will make it much easier to work with when soldering)
4) You can also remove the black plastic insert that centers the LED emitter on the board.
5) There are just two solder connections to desolder and remove the old emitter from the board.
6) Add a bit of thermal paste to the bottom of your new emitter and solder it into place. I found this was easiest if you place the new emitter in the plastic insert to ensure that it is properly centered.
7) Re-assemble light.
The UK Mini Q40 eLED plus is rated at 40 lumans
I loved the brightness of the halogen Ikelite PCa
my wifes exploded underwater when
we used rechargeable batteries
The Priceton-Tec is rated at 47 lumans.
The Ikelites are not LEDs, so they have only a few hours of charge and I believe you will find the website claims not to use rechargeable batteries with the PCa/PCm.
The UK Mini Q40 eLED plus is rated at 40 lumans
So of those listed the Priceton-Tec looks to be your best bet.
If you want really high power the Dive Rite LED 500 is about 10 times the light on AA batteries, but also about 10 times the cost
Thanks everyone. I ended up ordering the PT Torrent LED and the new Ikelite PC-a LED. I have a strong feeling that the Ikelite will be the superior model, but am also hopeful that the PT model will be easily modifiable with a brighter LED emitter similar to other PT lights that I have modified.
I'll return the lesser light to the dealer and replace it with the better one.
I can't find any specifications for the new Ikelite, but the "5Watt" LED sounds like it might be one of the newer versions and no modifications will be necessary. . .