| Formula | Calculator | Reverse units |
|---|---|---|
| 1 wattsecond (light at 5550 angstrom) = 680 candela second steradian | Factors for candela second steradian | |
| 1 wattsecond (light at 5550 angstrom) = 0.9956076 joule (quantity of light) | Factors for joule (quantity of light) | |
| 1 wattsecond (light at 5550 angstrom) = 0.1888889 lumen hour | Factors for lumen hour | |
| 1 wattsecond (light at 5550 angstrom) = 680 lumen second | Factors for lumen second | |
| 1 wattsecond (light at 5550 angstrom) = 680 lux second square meter | Factors for lux second square meter | |
| 1 wattsecond (light at 5550 angstrom) = 680 talbot | Factors for talbot |