I purchased some of these repro C-6 multi colour bulbs. Got them yesterday and was very pleased with them. They are very well made, not like the cheap imports of the 50's. They are 15V 3 Watt as compared to an original C-6 which I believe is rated at 4 1/2 watt.This might cause compatibility problems if you mix them on one string, but I relamped an entire string and thet looked beaut iful. They run much cooler than the originals, which could easily char the branches of a natural tree. I think you would find these lamps useful and well worth the money!