The BS bulb is more durable, to be sure.
The BS bulbs come in two flavors: We'll call them original and new (or small and long.)
Sartek is doing BS "upgrades" for $125. They use the small, original style bulb. They fabricate an aluminum extender (about 1/2") and install it on the light post so this smaller bulb sits at about the right spot within the test tube, such that the reflector will deliver the variable wide / narrow adjustable beam.
The good news is you pay about half of what the W/A bulb alone costs, and you get a very durable alternative. The bad news is some people do not like the light this smaller bulb casts. After diving a W/A 18w for several years, I can say it is different. The color temp is different, there is a pinkish cast to one side of the beam, etc. Honestly, I like the light of the W/A better.
That said, I do not regret getting the upgrade. I use my light for night lobstering and on every day dive - so I never dive without it. It gets bumped and knocked around quite a lot - Surf entries and exits, the occasional roll in the sand, etc. So I appreciate the durability of it. The color temp and pink spot are a small price to pay for a light that will last and last, IMO.
The newer, longer BS bulb that Salvo uses is supposed to be even nicer. I just secured a 21 W Salvo, and this Thursday night I'm taking both out for a sort of Bright Star shoot out. I'll let you know what I find.
There are a lot of smart people here that can assist. There are also lots of smart people on TDS that can assist. (
www.thedecostop.com) Lots of people have modified their Saturn V / Silo / Duraflame Pro 14's. Cut down the canister, switched out to NiMH batteries, etc, etc.
Keep posting questions - people will respond.
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Ken