The Magtech QM40-U48-0850-XP is a programmable 500 - 850mA constant current LED driver. It is programmable 50mA at a tive with Dip switches. The Magtech QM40-U48-0850-XP is 40w maximum and has a 10 - 48Vdc output. It is also 4 in 1 dimmable, ELV, Triac, 0-10V and PWM.