Mean Well's PWM-40 Series Power Supply is a 40W waterproof constant-voltage output LED power supply series. Differentiating from general DC output power supplies, PWM-40 transmits PWM style output, adapting to directly driving all kinds of LED strips that the color temperature can be maintained and the brightness homogeneity can be assured. Adopting a universal input range between 90VAC and 305VAC and incorporating the built-in PFC function, this series is also designed with a 3 in 1 dimming function (0~10Vdc or PWM signal or resistance) that simplifies the brightness adjustment for system designers so as to achieve light reduction and energy conservation.Providing a high efficiency up to 90% and a low no load power consumption below 0.5W, PWM-40 can satisfy the energy saving demand for LED lighting. The class II design (without FG pin) and the double insulation weather-resistant cable (SJTW) on the input side make it convenient for users to flexibly install on various types of lighting systems. The enclosrue design is a 94V-0 flame retardant plastic case and the interior is fully potted with silicone that enhances the heat dissipation and allows PWM-40 to meet the anti-vibration demand up to 5G. The PWM-40 Series also conforms to IP67 level, enabling it to be used in a high dusty and highly humid harsh environment. The entire series can operate under the temperature between -40~+70ºC and comply with the relevant global lighting safety certification.