I'm presuming you're doing it to make the black tones to look more black, in which case there really isn't going to be anything in it, might be easier with the wiring of the single tube though
i dont quite understand why it has to been those numbers specifically
surely any low light is fine as the whole point is simply to distinguish the tv and the wall :s
Also odnt most modern tv's have a backlight feature built into the tv? or is that soemthing different