You want temps 105-110 for a baby-- 95-110 for juvie-/ adult-- it is trial and error w/ basking bulbs-- no colored or off white- you need a bright white basking and for a 50 gallon start w/ a 100 but make sure you have a digital probe thermometer to get actual temp- place where he sits to bask for 10 minutes or then get the tempI have a 50 gallon enclosure with a bearded dragon just wondering on the basking light what size should I use to make sure that the temperature reaches its appropriate area