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Chapter 12, Problem 29P
To determine

Find the efficacy of the 40W CFL light.

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3.) A classroom is 30 ft by 30 ft with a 12 ft ceiling. You want to determine the average illuminance on the floor from recessed luminaires. What is the RCR value that you will use to determine the appropriate luminaire CU? RCR =
4. An incandescent lamp has a tungsten filament whose resistance is 96 ohm at its operating temperature of 2900°C. Calculate the filament resistance when the lamp is disconnected from the electric source under which conditions the temperature is 24°C.
The answer is 12920 lumens, convert it to watts. I need the solution how to convert 12920 lumens to watts, asap. Thank you
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