W
watt†
the unit of power (rate of doing work). In electrical calculations, one watt is
the power produced by a current of one ampere across a potential difference of
one volt. The symbol often used in equations is "P," although
"W" is also acceptable.
wavelength†
the distance between two successive points of a periodic wave, in the direction
of propagation, at which the oscillation has the same phase.
wide-angle
diffusion that in which flux is scattered at angles far from the
direction that it would take by regular reflection or transmission. See
narrow-angle diffusion.
wide-angle
luminaire a luminaire that concentrates the light within the cone
of a comparatively large solid angle. See narrow-angle luminaire.
workplane the plane on which a visual task is usually
done, and on which the illuminance is specified and measured. Unless otherwise
indicated, this is assumed to be a horizontal plane 0.76 m (30 in.) above the
floor. 
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