You can raise them outside but you will have to make sure all temps, shade, hydration are correct..
Unless the bulb is defective or they are forced to be extremely close to the bulb. You can do a process of elimination. First switch out the bulb or just simply turn it off. See if anything changes by the following day. Make sure you are giving enough hydration and humidity.
*For the first few days i wouldn't put any feeders in with them.