Yep, those are the bulbs. I use one BCA also, which is slighly less bright, but has a higher temperature rating, to give it that bluish elecrical arc look.
I only put mine out on Halloween night, and I haven't had rain for the past few years that I've used them. The good news is that they don't stay on very long, rather they just flash for a few brief seconds every couple of minutes, so they don't have a chance to get really hot. That's the reason bulbs explode: the rapid temperature change causes the glass to shatter. In a drizzle, I would even feel comforatble covering the front of the fixture with some clear plastic to protect the bulb. A weather-proof enclosure would be great, just make sure you use a reflector in there to maximize your output.
Don't be intimidated about the life. Again, the total "on" time for a night is probably no more than 10 minutes. You should be able to get several years out of a bulb, even if you use it for a week during the season.
You're right about the brightness, and with two of them running off one box, you maximize your lumens while staying within the wattage specification of the box. It works really well, and is very cost effective.
Go for the photo floods. You won't be disappointed!
Good luck!
-dgm
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