Glow in the dark stars and murals charge and glow best from natural daylight/sunlight but in most rooms they usually need a little extra boost because of timing... 

By the time bedtime comes around, sometimes the stars have been discharging light for a few hours and won't be as bright as they can be. A 10 minute top up with a bright room light can help when natural light isn't enough. 
LED Tubes and room lights are usually great for a bright charge.

Bear in mind with this natural daylight/room light charge it will give you stars that glow all night but will usually not be enough charge to give you the bright colours that pop for about 10 minutes after a full and maximum charge. 
For bright colours you'll need a maximum 100% charge with a UV light. 

Basements and home theatres will always need to compensate for the lack of daylight, with bright direct light. Use UV flood lights and bars (395nm at 30-100 watts) in dark rooms. A 100 watt UV flood will charge a large star ceiling in under 10 minutes. 

LED UV flood lights and bars can charge the stars even faster within seconds if you hold them closely. Party lights and blacklight bars that are around 395um are pretty safe but they can still irritate eyes and skin. 

UV lights are not necessarily needed though and high powered UV lights (365um) should never used in kid's bedrooms as UV light can be a hazard to skin and eyesight. Avoid staring directly at UV light! 

Incandescent bulbs and Halogen lights are not very effective at charging glow in the dark stars. The Black light bulbs (UV bulbs) I've tested are all pretty weak and I wouldn't recommend them.