Diurnal basking lizards tend to use intensity of light as well as heat to find a basking spot, so I would put a twist-in flourescent (very bright and efficient) over the basking spot near the heat emitter to keep the basking spot bright.

I use halogen bulbs (from home depot) most of the time. You can get more heat from a 50 watt halogen then you'll ever get from a 100 watt reptile bulb. The lights go on in the morning, and at night they turn off. Never have a need for night time heat with my beardie, uromastyx, or russian tort. They seem to do fine with temps as low as low 60's during the night.

Conversly, I know some monitor keepers/breeders keep their lights and heat on all day and night. The monitors know when it's day, and when it's night time, they retreat to their burrows (most of the time) from what i understand. Doubt it would work with beardies though.

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