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1ponders,not sure what one of the so described light boxes is or how many globes you have used but if it has 1 x 20watt globe and it is rated at 12 volts then ohms law is I=W/E where I = Current W = Watts E = Volts.Thus I=20/12 I=1.666..........7 amps lets say 1.7 amps.If each globe is connected in parallel accross 12volts and lets say there are 4 globes then to light them to maximum brilliance you will need a power supply that can deliver 6.8 amps at 12 volts.If they are connected in series then the resistance of each globe affects the total voltage that is required to light them to full brilliance.Hope this helps.
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