We are always strict in aging testing, there are 5 times testing before leaving factory! For the par light, it takes 4 hours each time for final testing before sending into warehouse, for the moving head light, it takes 8 hours each time. Function in each channel of the light is checked carefully , if there is something wrong, it will be forwarded to the technical department and fixed, then be tested again to ensure the problem is solved. We also have hang testing, side mounted testing, shaking test, interference testing, and brightness testing etc. If goods in warehouse beyond 2 months ,we will do testing again before shipment.