Also - I have had 4 friends who bought new bulbs/lamps and had their barns or coops catch fire in the middle of the night. I've been told to only use a heat lamp in an unsupervised area such as a coop in the middle of the night when there is no other choice. Inside your home with heat lamps is generally safer because people typically are there to supervise or notice a fire if one should start, and homes are equipped with fire alarms. It's always good to use new bulbs and lamps/equipment. I was told it is often the cords or outlets that start the fire in the first place, so using extension coryou can gauge your outlets by using your hand to feel the outlet that your heat lamp is plugged into often and if it feels hot unplug so it can cool down. If the outlet you're using is getting hot regularly then it's smart to relocate to a different outlet. Make sure you are not using a bunch of extension cords, and to only have the heat lamp plugged into the outlet alone with no other electronis/items plugged into the same outlet.
Thats great! I had to do the same thing at first so my adult hens got used to seeing the chicks. It's inevitable for them to establish the pecking order, violently at that lol, but at least the chicks will be protected while they are growing/developing. I hatched/raised my ducks and chickens in the dead of winter, it was rough because we really couldn't put them outside for a long time. Good luck with transitioning your little babies! They look adorable.