I am currrently using a Fenix L2D on the side of my helmet.
It is waterproof, has multiple brightness levels (up to 180 lumens!) and very long runtimes if you don't run it on "turbo" all the time. But you can get 8% off and free shipping with the coupon code CPF8. If purchased from the fenix store, they will guarantee it for life and shipping from Georgia is very quick for those of us in TAG.
https://www.fenix-store.com/product_inf ... cts_id=362Features:
* Utilizes a Premium (Q5) Cree 7090 XR-E LED with a life of 50,000 hours
* Two modes of output, selected by turning the bezel (patented)
* General Mode: 12 lumens (55hrs) -> 53 lumens (10.5hrs) -> 107 lumens (4hrs) -> SOS
* Turbo Mode: 180 lumens (2.4hrs) -> Strobe
• 28 days of survival use (2 continuous hours per day on the lowest setting)
* Digitally Regulated for Constant Brightness
* Uses two 1.5V AA ( Alkaline, NiMH, Lithium ) batteries (not included), inexpensive and widely available
* 14.7cm (L) x 2.1cm (D) or 5.8 in (L) x 0.8 in (D)
* Made of aircraft grade aluminum
* Durable Type III hard anodized finish
* 56-gram (or 2.0 oz) weight (excluding batteries)
* Waterproof to IPX-8 Standards
* Toughened ultra clear glass lens with AR coating
* Push-button tail cap switch
* Capable of standing up securely on a flat surface to serve as a candle
* Batteries not included
* Includes a holster, a lanyard, two spare o-rings, and a rubber switch boot