I have a couple of "sealed" devices that apparently have negative temp coefficient devices inside of them that are placed between a power outlet and the lights. The lights start out at 1/3 normal brightness and come up to full level in 5-10 seconds. Soft turn-on means less light failures. I would like to have/make several of these, but I don't know what is inside the boxes and don't really feel like tearing them apart if I don't have to.

Suggestions!