He he, I have learned a lot today, I learned that the data modulates a 38khz carrier. Thats makes it impossible to modulate a filament type lamp though it would not be too hard to put a chopper disk on a mains synchronous motor to chop the light from a QH lamp, that would certainly get the 38khz infra red to flood the display space.
John,
It's along time since I played with IR remote devices !
There are a few different carrier frequencies in common use usually between 35- 40kHz
You would need to use IR LEDs for the flood light, not difficult or too expensive, but you may need quite a few LEDs if it's a big hanger! It might even be possible to construct the unit as a passive repeater by using a different carrier frequency to send commands to the unit (would save a lot of wiring)
However, if you are going to have to send several common (e.g. 'chapter', '1', 'play') commands the main problem would be maintaining synchronisation between players; i.e. if one took too long to change to 'chapter 1' it might miss the 'play' signal or - nightmare scenario - the units have a play/pause button, 'cos you just know one will get out of sync.
If you need to send different chapter select commands to different machines, it just not going to work ( Although, Sony machines often have a selectable device number so multiple players can be addressed)
It may seem a silly question, but have you checked that the DVD machines don't have a auto-start/play function? It used to be a common feature on VCRs & cassette players for exhibition use.
Bill