OSRAM HQL bulb is diffuse ovoid (egg-shaped) high pressure K wik lamp. The exterior is a hard-glass outer bulb with a white inner coating. Characterized by its low cost and durability. Version with standard lamp base (E27 or E40)
Application. This OSRAM HQL used in public lighting, illuminate streets, parking lots and other general public locations. Often in wall lights and lampposts. The HQL lamps with E27 and E40 lamp base to be used with a conventional ballast.
Lifetime of HQL. Loss of 5% at 6,000 hour, 20% at 12,000 hours and 50% failures 16,000 hours. The light yield at 25 ° C is about 50 lumens / watt. This HQL bulb is not dimmable. 
