The surface temperature of a 100. W incandescent lightbulb is 60.0°C. The surface temperature of a 20.0 W fluorescent tube producing the same amount of light as the 100. W incandescent lightbulb is 30.0°C.
Determine the steady state irreversibility rate of each light source when the local environmental temperature is 20.0°C, and comment on which is the more efficient.