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13 Nov 2010 Guide numbers are mostly used on speedlights and watts-second is Example: a studio flash with rated at 250 Ws may have a light output
If you know the watt sec. output of a studio flash unit how do you or can you A good explanation and definitions can be found here were given was to convert from watt second output to a guide number and then apply that
19 Feb 2012 Typically, the higher the WS, the higher the guide number but there is no real direct Watt/sec is a measure of energy going into the flash tube. It's Watt-seconds not W/sec, it is the definition of the energy unit Joules.
2 Sep 2016
Guide number to watt-second comparison in Flash and Studio Lighting. set the strobe to 60 Ws and the flash to 1/1 and used a light meter to measure both. .. to be very helpful in understanding the world of apples to apples
18 Jul 2008 "Watt Second ratings do not indicate light output" a flash unit with a 120/feet GN is about 3300 BCPS (a Sunpak 383 or . Power has absolutely no meaning unless you comparing two identical units under the same
Guide Number simply is the multiplied product of (flash distance x f/stop) for a be computed - there is no equivalence of watt seconds of energy and Guide To have any meaning, any two Guide Number ratings to be compared must be:.
Home > Studio Flash Explained > Efficiency, Wattseconds, and Units of Measure Beam Candlepower and Guide Numbers are measurements of light emitted
11 Dec 2010 No, there is no way to convert guide numbers to watt-seconds. are ill-defined as well, so are basically just as useless as watt-seconds.
Guide numbers are mostly used on small flashes usually mounted on cameras and watts-second is being used on studio strobes/lighting.
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