This product is a set of approximately 40 BC coloured light bulbs. The bulbs use incandescent technology. Selection of colours Bulbs are mainly 25 Watt but there are a few 40 Watt Bulbs mixed in. I have tested a small selection of the bulbs and as far as I can tell they are all in working order but these have been in storage for a number of years so cannot 100% guarantee that all bulbs work
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