Hid is the way to go. Rechargeable is the way to go. Canister is preferred so you can use a goodman handle and minimize the lighthead. The cannon light cannon is bright but bulky. A cansiter will not work on all jacket style bc's. If you use a bp&w I highly recommend the canister style. Not all hid's are created equal. They come in big/small, good enough/super bright, long/short burn time, fragile/durable, narrow beam/wide beam, good penitrating/penitrates through steel like a laser. My vote go with durable, had luck with oms and sar-tek, halcyon have blown a few bulbs on minor hits that oms and sar-tek shrugged off. I still use a oms 10w hid and a 18w Halcyon. The halcyon is the brightest, most penetrating light out there that i've seen to date both 10 and 18w when compared to dive-rite's 21 sar-teks 10 and oms 10. I've owned 2 oms lights up to know and found them to be bulletproof, very very durable in my opinion. The 18w halcyon I own and 10w my buddy owns have each broken bulbs. I'm abusive to my gear and being without my light is bad for me as I love night diving, deep diving and looking into holes. Sid