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sci.luminous-efficacy-LED-driver Calculator
Calculates LED luminous efficacy (lm/W) from radiant flux and spectral response, and driver efficiency impact on system efficacy. LED chip efficacy > 200 lm/W is state-of-the-art (2024); complete LED luminaire efficacy 150–180 lm/W — incandescent bulbs achieve only 10–15 lm/W.
Inputs
P Watts
Rate of energy transfer (W). P = V×I (electrical). P = F×v (mechanical). 1 horsepower ≈ 746 W.
Lm Total
Reference formula or conversion factor shown for context.
Driver Eff Pct
Useful output divided by total input, as a percentage. 100% is impossible due to losses (heat, friction, resistance).
Therm Derating Pct
A multiplier applied in the calculation.
Results
nominal efficacy (lm/W)
CAC (customer acquisition cost) -- total sales and marketing spend divided by new customers acquired. Healthy LTV:CAC ratio is 3:1 or higher.
system efficacy with thermal derating (lm/W)
A standardised quality or risk rating on the applicable scale.
actual luminous flux at temperature (lm)
The value at the specified point or condition.
LED power (after driver loss) (W)
The decrease or degradation from the baseline.
Efficacy = Φ / P_in (lm/W)
CAC (customer acquisition cost) -- total sales and marketing spend divided by new customers acquired. Healthy LTV:CAC ratio is 3:1 or higher.
efficacy class
The classification assigned based on the computed value.