Timeguard mlw150c energy saving halogen floodlight black timeguard mlb150c the timeguard mlb500c energy saving halogen floodlight in black will only illuminate at night when the built in passive infrared pir motion sensor turns on the floodlight when it detects motion in its coverage area this halogen light is will light up the whole side of a house and only use a minimal amount of electricity p this powerful timeguard mlb500c energy saving halogen floodlight boasts 500w of l