CPF-Cadlepower forums (Duh!)
LOL-Laugh out loud
IMHO-In my honest/humble opinion
IMO-In my opinion
Lux-Lumens per square meter (An actual technical term)
LED-Light Emitting Diode
SSC-Seoul Semiconductor, a LED manufacturer. Usually referring to their P4 LED, which is based on the Cree die
Cree-Not really an abbreviation, but a commonly used term. A LED manufacturer. Usually referring to the Xlamp 7090 XR-E, a very efficient LED.
Milky/Milky mod-Referring to Milkyspit, a modder who is held in very high regard on CPF, or one of his mods.
I'm sure there are many I have forgotten, but they are some.