- 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...
-
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...
-
quantity measured in
watts per
steradian (W/sr)
Luminous intensity, a
photometric quantity measured in
lumens per
steradian (lm/sr), or
candela (cd) Irradiance...
- 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...
- the
candela as 1 lm = 1 cd·sr. A full
sphere has a
solid angle of 4π
steradians, so a
light source that
uniformly radiates one
candela in all directions...
-
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...
-
neutrinos and
other particles. The SI unit of
radiance is the watt per
steradian per
square metre (W·sr−1·m−2). It is a
directional quantity: the radiance...
- 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...
-
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...
- 1700 lumens; if that
light is
radiated equally in all
directions (i.e. over 4π
steradians), it will have an
intensity of I V = 1700 lm 4 π sr ≈ 135 lm / sr...
