Marpan Supply Company, Inc.  
low pressure sodium

 high intensity discharge
 low pressure sodium
T17 & T21 - these energy efficient lamps emit a characteristic yellow light that is ideal for certain exterior street and area lighting, clear bulb finish, by22d base, 18, 35, 55 90, 135, and 180 watts.
  
see our full line of
High Intensity
Discharge Lamps