The EG-200 "Big E Bulb" is a direct replacement for 400 watt metal halide lamps. Simply screw the EG-200 into the fixture with no need to bypass the ballast. It works within any building line voltage from 120v to 480v and anything in between as long as you are using a functioning metal halide ballast. This includes 347v for Canada. The EG-200 is also energy efficient. Each lamp is 180 watts which dramatically cuts your energy consumption. Additional advantages against a regular metal halide are higher lumen maintenance, instant start up and restrike, no color change, better color temperature, higher color rendition index (CRI) and cooler running temperature.