## Lighting System

Incandescent bulbs are filament lamps whose principle f operation is based on light production when the tungsten is heated. Compact fluorescent lamps are discharge lamps that operate on the principle of discharge between the cathode and anode of the lamp. They are efficient, long lasting and have a large lumen output for a small rating (Basic Facts about Residential Lighting, 1994).

Number of guest room; 200.bulbs per room; 4.Total number of bulb= 200*4=800.

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Room occupancy=60% of 200=120 room.

Incandescent lamps: Lamp rating of 75 watts. Has a lumen output of 1100 lumens. Average cost of one bulb is about \$0.5. Hence total cost=0.5*800=\$400.Total lumen output per room=1100*4=4400 lumens. Total power rating of the whole house=800*75=60kW. Total power ratings considering occupancy=120*4*75=36kW. Kilowatt hour rating=6*365*36=78,840 kWh. Which in referred to as 78,840 units. Assume cost per unit of electricity=\$0.1125, the cost for the year =0.1125*78840=\$8869.5 (Kanter, 2009).

Compact Fluorescent Lamps: Lamp rating=20 watts, 1100 lumens, cost =\$3.Total cost for installing the bulbs=800*3=\$2400. Total wattage rating of the room=20*800=16kW. Total power rating considering occupancy=120*4*20=9.6kW. Kilowatt hour rating=6*365*9.6=21024 kWh. Which in referred to as 21024 units. Assume cost per unit of electricity=\$0.1125, the cost for the year =0.1125*21024=\$2365.2 (Basic Facts about Residential Lighting, 1994).

## Memo

Incandescent bulbs are bulbs that work on the principle of light production through heating of the tungsten filament. Compact fluorescent bulbs produce light through discharge of ions between the anode and cathode of the bulb (Ford, 2008).

Incandescent lamps are cheaper to purchase and set up as compared to the expensive compact fluorescent lamps. However, compact fluorescent lamps are more efficient as they use less power; this is proved from the calculations above.

Incandescent bulbs also produce a lot of heat and have a short life span of 1000 days as compared to the 10000 days for the compact fluorescent lamps. In addition compact fluorescent lamps have very large lumen output. As shown both 75W incandescent and 20W compact fluorescent produce 1100 lumens (Ford, 2008).

I advise you to use the compact fluorescent lamps over the standard incandescent lamps. Though the initial cost incurred in the setting up of the lighting system will be high for the compact fluorescent lamps, the long term effect are quite different. As shown in the calculations the amount of money spent on the system with incandescent lamps per year is \$8869.5 while that for the compact fluorescent is \$2365.2.

In the long run, a lot of money that could be spent on the electricity expenses is saved. In addition, less amount of money will be spent on the maintenance of the lighting system because compact fluorescent lamps have longer life as compared to the incandescent lamps (Kanter, 2009).

## References

Ford J.D. (2008). Residential Lighting. Compact Review, 20, 541-561.

Kanter, R. (2009). Compact fluorescent lamps. New York: Free Press.

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