The Robinair 16330 Super Kit is a 12-LED True UV Cordless / Rechargeable Leak Detection Lamp. It features twelve LEDs which produce hi-intensity true UV light, which makes even the smallest leak easy to spot. The dye combines with the refrigerant lubricant and migrates out at the leak, where it is illuminated in the beam of the UV light. UV leak detection can be used for both automotive and HVAC-R systems, and dyes won’t harm the system. The durable design stands up to everyday use and the pistol-grip design is comfortable to hold. The bulb is rated for 3000-hour life and can be replaced when necessary