RW>RN> Whatever he added to that combustible liquid did suds up, which made
RW>RN> me think it was a detergent.  And the way the lamp fixture was made,
RW>RN> the hood obscured the bulb.
 
RW> We must be thinking of different movies. I remember the bulb being
RW> exposed and I don't recall any suds being put in the bulb. The movie I'm
RW> thinking of, the alcohol was injected with a syringe through the base and
RW> then resealed.
 
In The Soldier (1985), with Ken Wahl, this enemy agent is dressed up like a
cleaning woman and replaces the light bulb in the CIA director's desk lamp.
Before that took place, the agent took an ordinary household bulb and
placed it on a stand made to hold the large end of the bulb atop a desk. 
He then took a small torch to the metal base, unsealing it from the glass
part.  With a small pair of channel locks, he carefully removed the metal
bse holding the filament from the bulb.  Then he poured what looked like
gasoline into the bulb and added the detergent to it.  The last step was
using a hot glue gun and carefully applying it to the rim of the glass bulb
at the neck.  He then carefully placed the filament and base in place and
made sure the glue held everything.  After it set, he picked up the bulb
and swished it around a little and you could see the liquid suds.
 
For those of you who haven't seen it, I heartily recommend this movie.
 
 
Regards,
 
Roger

... Power corrupts.  Absolute power is kinda neat, though.
--- D'Bridge 2.99