You can't calculate the power consumption either, the wattage given is
output power not input power. I remember the T20 also specified power
output which is 50Ws.
C.H.Ling
Jim Couch wrote:
>
> The basic problem is that watts masure how much the light DRAWS from its
> power source, and say little, if anything about how much light they put out.
> There is no way to take this figure and calculate light output. I have never
> understoond why manufactureres started measruing lights (light bulbs, studio
> lights, bicycle lights, whatever) in watts. I also wonder why we continue to
> do so. The information is really pretty much wortheless, unless you want to
> know what it will cost you to run the lights, or how long the light will run
> with a given battery.
>
> Jim Couch
>
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