There are two LED types included with the KidWind simpleGEN (KW-SGEN), a 10 mm red diffused LED and a 5 mm bi-color LED that appears white when not in use. Vernier does not sell replacements for the LEDs, and they are not covered under our standard 5-year warranty, as they are considered to be consumable items.

Since LED bulbs are generally very inexpensive, it is easy to purchase replacements. Here are some recommended sources:

For the bi-color LED:
AllElectronics: http://www.allelectronics.com/make-a-store/item/led-6/bi-color-led-2-legs/1.html
Amazon: http://www.amazon.com/Standard-LEDs-Through-Thru-Hole-Bi-Color/dp/B00M2DG7I2/ref=sr_1_5?ie=UTF8&qid=1432934202&sr=8-5&keywords=5+mm+bi-color+LED
For the red LED:
SparkFun: https://www.sparkfun.com/products/10632
Amazon: http://www.amazon.com/50pcs-10mm-Round-Diffused-Light/dp/B00KSSQHZ6/ref=sr_1_4?ie=UTF8&qid=1432934134&sr=8-4&keywords=10+mm+red+LED

We include these LEDs in the following kit:
KidWind Power Output Pack (KW-POP)

See also:
Are the LEDs in the KidWind Power Output kit resistor protected?
Can I purchase individual parts from one of the KidWind kits?