50 watt Blacklight Night Heat Bulb.
Can be used for daytime heat too without adding extra light.
Create a great "moon light" effect while heating at night with these bulbs.
These tungsten filament Heat Bulbs have an average lifespan and are rated at 1200 hours.
That is about 3 - 4 months under normal use on for 8 - 12 hours a day.
If they are on 24 /7, the lifespan is 1.5 - 3 months.