for the beacon deallies, they do make it easier for surface spotters and they're quite bright.
Glo-Toobs & LED Light Sticks Piranha Dive Manufacturing
I have the FX model there, has different flashing options which helps my buddy distinguish me and vice versa in a group. Never actually needed it, but we use them in buddy groups and have them flashing differently so from the surface we can tell which group is which.
LED Lighting Products Piranha Dive Manufacturing
Check out the predator 220's on there two. GREAT lights. Buddy uses them for backups, and they could be used as a small primary, no problem. When we're sidemounting we'll both mount two of them on our helmet instead of bringing a canister.
I use the Mini Deep Star's as my backups and they're great lights too, especially for the price. $25 for a bright LED, twist on, metal housing, and uses normal batteries... Can't complain about that
+1 on the Goodman handle vs. Pistol grip. With the Goodman handle you still have full use of your hand.
So for $140 from Piranha you get the Glotoob FX deally, and two Penetrator 220's with a Goodman handle on one of them. Much higher quality lights, and much more versatile in the long run. Penetrator 220 is a bit brighter than the Dorcy as well. My buddies have been on about 150 ish night/cave dives with no problems down to 200ft, and my mini Deep Stars have about the same on them.
Same price, higher quality lights. Can be used forever. These suckers are built to last and there's something to be said about that
LED is the way to go. No bulb worries, ever. Sometimes not quite as focused as an equivalent HID, but the lights you posted are real broad and not really good for a whole lot.... The other thing to think about is this. These lights we mentioned, Dorcy and Predator, are significantly brighter than the pistol grip lights, which is a plus on it's own. The second bit, is that they are a LOT smaller. You can clip one of these to a D-Ring or stick it in a pocket, and not have to worry about it getting broken on a diveboat or hit on something else. With a Pistol grip, they're huge, they get knocked around a whole lot, and are just an overall pain...