Here's how to Pimp your Apex. Be aware it voids your warranty.
http://candlepowerforums.com/vb/showthread.php?t=1...
You have to check out Posting #52
Here's the text:
1. Buy a Seoul SSC P4 Emitter, (USWOH, not on a star mount) and thermal grease from Photonfanatic here on the forums:
http://www.cpfmarketplace.com/mp/forumdisplay.php?...
or e-mail him at FredPilon(at)photonfanatic.com. Tell him it's for an Apex and order the same emitter that Richard E did. He's a former world champ Rogainer.
2. Open apex- remove 2 screws from back, remove hinge bolt and screw behind it.
3. Remove optic (lens + reflector assembly)
4. Remove luxeon emitter carefully. Pry out with fine flat screwdriver.
5. Clean the heatsink from the old thermal grease and add a little dot of new thermal grease, I used Artic Silver 5. Fred Pilon advises that Thermal Epoxy is a better electrical insulator, but once set the emitter is harder to replace in future.
6. Solder red wire to the positive terminal on the P4
7. Solder black wire to the negative terminal (the one with a notch in the other copper lead, look on the datasheet for the P4 and see)
8. Place LED where luxeon used to be, be sure that it has good contact with heatsink. Make sure wires don't touch heat sink.
9. Replace Optic. Turn on light to make sure the beam is centred properly- If not, re-position optic. It clicks in on 2 little pegs.
10 Reassemble apex. Don't forget to place the heat sink cover on before screwing the back on.
It is apparently easier to modify an EOS too. Very detailed instructions with photos:
http://www.candlepowerforums.com/vb/showthread.php....
You need a Star mount for this one.
See what happens when you're injured and have too much spare time?