T8 / T12 LED Retrofit Kit. Use this kit to replace your T5, T8 and T12 Fluorescent tube lights with this retrofit kit. Once you install this retrofit kit you can use energy saving LED Tube Lights. Includes six end caps, and 4 18 gauge wire about 22 inch long. The wire nuts are UL, CE CSA certified. This kit sames time and money by not having to find the supplies to do the retrofit job. This kit will convert single end and both end tube lights.