This falling Ice Drop Icicle with LED lights is meant to be used as a screw-in replacement with C-9 size (E17 base), commercial grade strands. There are a total of 12 pure white LEDs in this icicle. The icicle is 7"" long and 1.5"" wide. Fits directly into existing traditional sockets without extra transformers. Saves up to 90% on electric use. These lights are great for Christmas and Valentine's Day too. Each bulb consumes 1 watt of power so you can safely connect up to 1,125 bulbs on one 15 amp circuit. These are fine for simple on/off applications. Not recommended for dimming (as in some computer animated displays).