## Watts to Candlepower Calculator

Enter the values of power, P_{(W)} and performance factor, PF_{(lumens)} to determine the value of Candlepower, C_{(W)}.

__Watts to Candlepower Formula:__

__Watts to Candlepower Formula:__

Watts to candlepower conversion helps us understand the perceived brightness of a light source based on its electrical power consumption. We measure electrical power in watts, while candlepower represents the perceived light intensity.

In the realm of illumination, candlepower isn’t a direct measure of light output, but rather a representation of our perception of a light source’s brightness.

Imagine holding a lit candle – the perceived intensity of that light is roughly the baseline for one candlepower. While power (W) quantify the electrical power a light consumes, candlepower focuses on how bright a light appears to our eyes.

Therefore, a light source with a higher wattage or a higher performance factor will generally have a higher candlepower, leading to a brighter perceived light. This understanding helps us choose lighting that balances desired brightness with energy efficiency.

For example, a high-wattage incandescent bulb with a low PF might have a similar candlepower to a lower-wattage LED bulb with a high PF, even though the LED uses less energy.

Candlepower, C_{(W)} in watts is calculated by multiplying the power, P_{(W)} in watts by the performance factor, PF_{(lumens)} of the light source in lumens and then dividing by a constant value (12.57).

Candlepower, C_{(W)} = P_{(W)} * PF_{(lumens)} / 12.57

C_{(W)} = candlepower in watts, W.

P_{(W)} = power in watts, W.

PF_{(lumens)} = performance factor in lumens.

__Watts to Candlepower Calculation:__

__Watts to Candlepower Calculation:__

- An incandescent bulb uses 60 watts (W) and has a performance factor (PF) of 1.8 lumens. What is the candlepower?

Given: P_{(W)} = 60 W, PF_{(lumens)} = 1.8 lumens.

Candlepower, C_{(W)} = P_{(W)} * PF_{(lumens)} / 12.57

C_{(W)} = 60 * 1.8 / 12.57

C_{(W)} = 8.6W.

- An LED flashlight has a candlepower of 150 cp and a performance factor of 20 lumens. How much power (watts) does it use?

Given: C_{(W)} = 150 cp, PF_{(lumens)} = 20 lumens.

Candlepower, C_{(W)} = P_{(W)} * PF_{(lumens)} / 12.57

P_{(W)} = C_{(W)} * 12.57 / PF_{(lumens)}

P_{(W)} = 150 * 12.57 / 20

P_{(W)} = 9.43W.