* Values are Initial LPW averages taken from several samplings of each bulb, actual values vary with manufacturer and time. Check current stats for several brands before deciding on a bulb. Mean LPW for sampled bulbs are appx 10-15% lower than Initial LPW for HPS and Fluoros, and appx 25-35% lower for MH.

1 - Greater than or equal to 40W (usually 4 feet or longer, can include some compact versions)

2 - Less than 40W (usually less than 4 ft long or screw-in, stick, or circular compact versions)

3 - 940,360,220, and 150W HPS conversion bulbs for use with 1000,400,250,175 MH ballasts respectively.

4 - Figures under the Avg column are LPWs for the most common middle-of-the-road lights (400watt HIDs and 40watt FLOR tubes). Hi/Lo figures are LPW extremes from all sampled wattages for that bulb type.