This ancient thread from aquaria.ca seems to suggest you just twist the 4 red wires together and run the lights in series if you want 2x110 out of 2 lamps. Would the same principle apply to 8x24w? The lights might actually be overdriven slightly.
http://aquariacanada.com/forums/showthread.php?t=244
Argh, my head is swimming.
Need me an electrician to chime in methinks!