Christmas Workshop Ultra Bright LED Chaser String Lights - White Available in 70, 200, 400, 600 and 1000 LED String Lengths Ultra bright LEDs means your bulbs will not need to be replaced, give a brighter light and use a lot less energy than traditional bulbs. Fitted already to the set is 8 modes: Combination, Waves, Sequential, Slow Glow, Chasing/Flashing, Slow Fade, Twinkle/Flash & Steady On. Can be used indoors and outdoors making the LED Flashing Chaser Fairy Lights extremely versatile and can be used on windows, Christmas Trees, bedrooms and more! Indoor & Outdoor Use White LED Colour Ultra-Bright LED Lights 7cm spacing between LEDs 5m Lead - making it versatile & easy to install 8 Functions 70 LED = 9.8m Length 200 LED = 18.9m Length 400 LED = 32.9m Length 600 LED = 49.9m Length 1000 LED = 74.93m Length If using these chaser lights for Christmas Trees. A General Rule of thumb is 100 Lights for every 1 1/2 foot of tree.