I really don't know why the description doesn't just tell me what I wanted to know. ...So I bought a couple of these to find out: amperage draw at 12.7 Volts is 3.1 Amperes. Luminous intensity is about 1,500 lumens at 10 feet. Yeah...I know...everyone's meters are different and input voltage on this unit can range from 9 to 30 volts. I'm not arguing the specs as posted, but in a 12V system, this is a nice, bright, 40 watt light.