Mean well pwm series led power supplies constant voltage pwm output ip67 mean well pwm 40 12 this 12v 40w led driverpower supply features a constant voltage pwm output the pwm output is able to maintain colour temperature and brightness homogeneity when driving multiple led strips a 3 in 1 dimming function dim to off varies the output duty cycle providing great flexibility in lighting designs the driver is supplied in a fully encapsulated plastic case that has ip67 protection making i