You said..."if you use an incandescent bulb for heating then do you cut it off at night so that the dragon gets a period of darkness?"..yes, of course! Don't they sleep in the dark in the wild?

You said..."if so then what do you use for heat during the night?...I use a black light for heat then have my UVB light on a timer...am I doing anything wrong?"...if the temperature doesn't go lower than about 66F during the night, there should be no need for night heat. If you are using the black light during the day as a "basking" area your dragon may not recognize it as a place to bask...also I'd be concerned about the light spectrum that the black light produces.

Some black lights produce UV...but its not in the range that the dragons need....
http://en.wikipedia.org/wiki/Ultraviolet
http://listserv.uoguelph.ca/cgi-bin/wa?A2=ind0405e&L=waterdragon&P=1369
"BL fluorescents may be used to provide UV for reptiles during the day - but you still need bright white light to promote basking"..."Never provide UV at night".

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