| Formula | Calculator | Reverse units |
|---|---|---|
| 1 wattsecond (light at 540 THz) = 683 candela second steradian | Factors for candela second steradian | |
| 1 wattsecond (light at 540 THz) = 1 joule (quantity of light) | Factors for joule (quantity of light) | |
| 1 wattsecond (light at 540 THz) = 0.1897222 lumen hour | Factors for lumen hour | |
| 1 wattsecond (light at 540 THz) = 683 lumen second | Factors for lumen second | |
| 1 wattsecond (light at 540 THz) = 683 lux second square meter | Factors for lux second square meter | |
| 1 wattsecond (light at 540 THz) = 683 talbot | Factors for talbot |