Term - Joule (Watt-second) |
| Joule (Watt-second) | SWPP Photographic Glossary | Saturday 2nd December 2023 |
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Joule (Watt-second)Indicates the energy content of the storage capacitors in an electronic flash. One Joule is the light output given by one watt burning for a second. Therefore a flash unit with a storage capacity of 300 Joules can supply the power to light a 300W lamp for one second. It doesn't take into account any electrical loss between the flash capacitor or flash tube, or the efficiency of tube and reflector.
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Information provided by: SWPP |
