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.
Joule (Watt-second)
Techniques Glossary 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.
What are watt-seconds, and how many do you need? Mark Wallace takes several minutes to explain watt-seconds, how they influence the amount of light emitted by a flash, and what other factors may effect light intensity.
Watt-second is an alternative unit of energy, equal to the joule.
Wavelength describes the distance from wave-crest to wave-crest between two corresponding waves of light in the electro-magnetic spectrum.
First off, watt-seconds are not a unit of light output; they're a unit of electrical usage. Different lights at the same power may give different levels of light.
Joule see Watt-second
Juice
The popular way to refer to electricity and eliminate four syllables.
Junior, Deuce, 2kW
A 2,000-watt focusing Fresnel Spot. Junior can also refer to (ah, the utter confusion) a 1,000-watt Spot.
As far as I know, no one has documented how many 150-watt-second flashes from six inches away it takes before a pygmy seahorse is terminally traumatized.
Energy is power over time, measured in Watt-seconds (Ws), also called a Joule, named after English physicist James Prescott Joule. A kiloWatt-hour is 1,000 x 60 x 60 or 3,600,000 joules.
The power of these units is usually specified in watt-seconds. The higher the rating, the more powerful the unit. Another important attribute is the unit's recycle time. The shorter the time, the faster you can get off the next shot.
For a bit of additional image pop, I positioned a 2400 watt-second strobe in a pan-reflector above and to the left of camera position. The strobe recorded an f/5.6 to f/8 on my incident strobe meter, slightly overpowering the ambient exposure.
Flash unit capacity is also described in terms of light output units such as beam candlepower seconds (BCPS) or effective candlepower seconds (ECPS) or in terms of energy capacity units such as joules or watt-seconds.
 See also: Light, Photograph, Watt, Camera, Flash
  
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