... luminious efficiency * Longer service life than blanded light mercury lamp Feature: Fluorescent powder coats the inner wall ... of our high pressure mercury lamps, which improves their color rendering properties. ... bulb are available. WE ALSO SUPPLY 80W,125W,250W,175W,250W,400W,1000W COATED AND CLEAR ... . 160W/250W/500W/1000W Blended Mercury Lamps(Bulbs) for Outdoor and Indoor lighting