There are new light bulbs in Canada, that fit a normal light socket but
have a spiral 'neon' like 4 loop twist. *I bought them because out electric
bills are rising, and these put out same light e.g. as 100Watt bulbs with 23
Watts use.  They don't have a refresh or flicker problem like some older
Neon tubes (above) and cost about 3x the cost of Tungsten Bulbs. This 3 pack
made by Globe (here) says the 3 will save $231. in energy costs and last
10000 (10 thousand) hours each.
   Would Those work for you Behind you?  (There are 2 sizes proportionately
lower than produce light of 60 and 40 Watts equivalent.    Some of your
symptoms might be from the 'refresh rate' ? of your TV (slower than a CRT)
or the special effects on whatever you're watching triggering
photosensitivity ??   You can't change the Refresh of the TV (60 hertz in
Canada for example),  but some amount of background might help?
   I just wondered.   G./
 (If you want the Theatre atmosphere don't you have to put Chewing gum and
spilled popcorn on the Floors ?  :-<  )