Mike:
There is a product called the “Flickermaster” from GAM lighting (www.gamonline.com)
It can be set to create a flicker effect to simulate fire, tv’s and other devices.
You might do a web search for similar devices.
Remember, your light should have a blueish cast to it as color tv screens give off light in a near daylight spectrum.
Alternatively, you might stack a couple of older CRT’s with the gains set higher/all using the same reception-image and just blast the light from that into your scene – an art imitates life imitates art real source light kinda thing.
Cheers,
Frank Otto