Dark Buster AG Pool Lights

Anyone know anything about the AG Pool Light called Dark Buster? I have one and it won't work. I was wondering do they have a bulb in them or are they a sealed unit. It looks like the cover comes off but, I can get it off with out possibly damageing it. It got me thinking that maybe you have to replace the entire unit.

Any ideas? I have searched the web on them and no luck.

I've very familar with these lights. The entire unit doesn't have to be changed, just the bulb assembly, which is a sealed plastic part that contains the bulb. If you need more help, let me know.

Josh