1. (15pts) An example of the T in the IPAT equation is the luminous efficiency of a lighting device. The visible light output of a light bulb is measured in units of lumens, and theoretically a watt can generate 683 lumens (assuming an ideal monochromatic light source that emits all incoming energy at a specific wavelength in the visible spectrum). a. If a 100 watt incandescent bulb generates 1800 lumens, what percentage of maximum efficiency is achieved? b. If a 25 watt compact fluorescent bulb generates 1800 lumens, what percentage of maximum efficiency is achieved? c. If a 40% efficiency of converting energy into light could be achieved, what would be the savings in dollars, per year of operation, per bulb, relative to a 100 watt bulb, assuming that the bulb provides 1800 lumens and operates continuously? Assume that electricity costs $.10 per kilowatt hour