The kids loved them. The lower bunk bed went from zero to hero. All of them wanted to sleep below the first night they were up.
Now, of course, if you want to do this make sure your bulbs don't get hot to the touch. In fact, LED lights are probably best. Mine are not LED but I can always touch them and I don't let them on all night.
My lights are always safe to touch and I also added a dimmer switch so that they don't have to be bright if the kids want to try and fall asleep with them on.
I attached them with simple safety pins which I think is also safer because they are not touching the bed or the bed sheets. I just hooked the safety pin through the hook on the globe light.
I got my globe lights at Target for only $14.99 which isn't bad for globe lights. There are 25 lights in all. In fact if you like globe lights for outdoor parties I recommend getting about 10 strings which is 250 lights which is sufficient for lighting an outdoor space. That's only $150 and $14.99 is the cheapest price I've seen for globe lights. In fact, a little tip, if you put them on a gift registry Target will send you a 10% off coupon in the mail for items on your registry. So you could get them for only $135. Pretty sweet.