- The
steradian (symbol: sr) or
square radian is the unit of
solid angle in the
International System of
Units (SI). It is used in
three dimensional geometry...
- in a
dimensionless unit
called a
steradian (symbol: sr),
which is
equal to one
square radian, sr = rad2. One
steradian corresponds to one unit of area...
- as
equivalent to one candela-
steradian (symbol cd·sr): 1 lm = 1 cd·sr. A full
sphere has a
solid angle of 4π
steradians (≈ 12.56637 sr), so an isotropic...
- 1
steradian beam, then the beam
would have a
luminous intensity of 1 candela. If the
optics were
changed to
concentrate the beam into 1/2
steradian then...
-
which includes two
dimensionless derived units, the
radian (rad) and the
steradian (sr). Some
other units such as the hour, litre, tonne, bar, and electronvolt...
- that
emits one
candela of
luminous intensity over a
solid angle of one
steradian. 1 lm = 1 cd × 1 sr {\displaystyle 1\ {\text{lm}}=1\ {\text{cd}}\times...
- and the
radian was
classified as a "supplementary unit"
along with the
steradian. This
special class was
officially regarded "either as base
units or as...
- the watt per
steradian per
square metre per
hertz (W·sr−1·m−2·Hz−1) and that of
spectral radiance in
wavelength is the watt per
steradian per
square metre...
-
radiant intensity is the watt per
steradian (W/sr),
while that of
spectral intensity in
frequency is the watt per
steradian per
hertz (W·sr−1·Hz−1) and that...
-
compact fluorescent. The
lumen is
defined as
amount of
light given into one
steradian by a
point source of one
candela strength;
while the candela, a base SI...
