Lighting Sources Incandescent - Incandescent is the most common residential light, where light is produced from a filament that glows when electricity is passed thru it. Most bulbs are general service, globe or decorative types. Advantages are low cost, warm pleasing tones. Advantages are better color, more lumens per watt, whiter light, longer life.
Disadvantage is higher initial cost.
Not available in many lamp wattages at present. Fluorescent - Fluorescent a more energy efficient type of lamp that produces light through the activation of the phosphor coating on the inside of the glass surface. Disadvantages are ballast noise, also good colors, electronic and dimming ballasts are more expensive. HID Lamps - HID Lamps High Intensity Discharge lamps emit light when electricity activates pressurized gas in a bulb. Longest lamp life and highest lumens per watt.