They have a lot to try to get used to when going to a new home so stress marks are typical.
Were you able to get a probe thermometer or temp gun so that you can make sure the temps are perfect? If it's too cold or too hot, can cause them to darken up.
What do you have for a UVB light or which were you thinking of getting?
Hey beardeddragonlover2 I hate to come on strong but YOU HAVE TO GET A UVB LIGHT! It is your responsibility as a dragon owner to provide compassionate care for you dragon, which includes a uvb light. Please please please listen to these people! They know what they are talking about. Go to walmart, get a 48 inch shop light fixture. Then go to lllreptiles.com and get a 48 inch reptisun 10 uvb tube bulb. Yes, they're expensive, but you must have them. It's is so easy to prevent health issues, so there is no reason not to. She has stress marks because she needs uvb. Please don't use a hot rock. I find that a 150 watt bulb does the trick for me.
Before you try to figure out what wattage bulb you need, you have to make sure you are using either a temp gun or digital probe thermometer otherwise the temps won't be accurate and if too cool, could cause sickness from digestion problems or if too hot, can cause rapid dehydration and even heat stroke.
That's unusual. I would try to return them for a refund if possible. I'd also check out the UVB fixture to see if anything stands out as a problem with that which could be causing the lights to burn out.
Yeah so my reptisun 10 that I got didn't work, got a new fixture and it is still working 4 months later, soon to be five months later. So yeah, if you get a cheapo one, it will probable burn out. Please note we mean a TUBE bulb, not a coil bulb. Long and thin. You want an electrical ballast cold start fixture.
What light fixture and bulb did you get? Did it just burn out recently? Could you check the prongs and make sure both sides are making a good connection?
Have you been able to get the tank all squared away? If the temps are off and they don't have what else they need, it can really affect their behavior.