# How Many BTU's Are There In A Watt-Hour?

Each Electrical Watt generates 3.412 BTU per hour

A Source 4 with a 375 watt lamp would generate 1279.5 BTU per hour

A Source 4 with a 575 watt lamp would generate 1961.9 BTU per hour

A Source 4 with a 750 watt lamp would generate 2559 BTU per hour

For Sensor calculations you should check the Sensor Dimmer Module BTU dissipation. How many BTU's are there in a Watt-Hour?n entry.

This calculation is useful for determining air handling in a building based on light output. Electrical Watt hours are different from Kilowatt hours in that Electrical Watt hours are energy output and Kilowatt hours are energy consumed.

**BRITISH THERMAL UNIT (BTU):** The quantity of heat required to raise the temperature of one pound of water one degree Fahrenheit.