Related Clues:
- Reagan's first interior secretary
- Mensa entrance requirement
- 1/746 horsepower
- Unit of light intensity
- Steam engine developer
- Unit of electricity
- Bulb rating
- Lightbulb unit
- Scottish engineer with a unit named after him
- Unit of light
- Genius detector
- Electrical power unit
- Coiner of the term ''horsepower''
- Horsepower fraction
- Word on bulbs