Spotlight: candela from luminous flux spread over the cone. cd = lm / (2π · (1 − cos θ)), θ = the outer-cone half-angle in radians. A narrower cone concentrates the same flux into more candela.
cd = lm / (2π · (1 − cos θ))
Spotlight: candela from luminous flux spread over the cone.
cd = lm / (2π · (1 − cos θ)), θ = the outer-cone half-angle in radians. A narrower cone concentrates the same flux into more candela.