So, change it to a 26 watt. Got it! thank you! and yes it is a reptile one and get a different heating light?The window is good for entertainment - not good for uvb- the glass filters out the uvb rays- so this is what I recommend - what brand are you using? Is it a reptisun brand? If so exchange the 13 watt for a 26 watt reptisun - have it in a reflective dome it will be shiny on the inside- have it unobstructed directly above the basking decor 6-8 inches- this bulb needs to be replaced every 5 months- I do not recommend coils but it's way better than the 13 watt you have - it's a death bulb-- then you can also take him outside for good uvb- direct sunlight on you for 15-30 minutes per day- if you use a container it needs to be a plastic tote- No glass---do not leave him you need to supervise him from birds - you can do this as a good supplement to the 26 watt- if you continue to use the 13 watt your dragon will quit eating and he will start developing mbd-+ dragons need uvb for overall health issues from skin to internal I cannot stress this enough