If the lamp will be totally enclosed within a UL listed fixture, then an enclosed rated lamp is acceptable. If the lamp will be exposed during usage, then this open rated lamp must be used. Open rated lamps can be used in open or enclosed fixtures and are safer lamps. MP lamps are protected and self-extinguishing in case of failure.

 

Manufacturer: PLUSRITE
Available in Clear or Coated Finish
Base Type: Medium E26

MOL (in): 5.44
Type: ED17-P
ANSI: M110/O
Wattage: 50 watts MH

Lumens: 3400
Color Temp: 4200 K 
Burn Position: Universal
Light Bulb Life (hours): 10,000+
Case Size: 12