The formula to calculate the Candlepower (C) is:
\[ C = \frac{W \times PF}{12.57} \]
Where:
Let's say the wattage (W) is 60 watts and the performance factor (PF) is 15 lumens/watt. Using the formula:
\[ C = \frac{60 \times 15}{12.57} \]
We get:
\[ C \approx 71.61 \]
So, the candlepower is approximately 71.61.