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Incandescent lamps
Page 59
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These have been around since Thomas Edison invented the light bulb in the early 19th century. These lamps are the most common on the market; their main benefit is low cost. However, typical bulbs are also the most inefficient source of electric lighting as about 90% of the energy used to light a bulb is wasted as heat. This is an unwelcome side effect if you are lighting a refrigerated vehicle or a poorly ventilated space such as a dry van or box.
Excessive voltage makes the bulb brighter but shortens its life, under-voltage makes the lamp dimmer but extends the life. The light produced by a standard incandescent lamp is yellowish in colour and the human eye haste work harder in this environment.
PROS: Inexpensive.
CONS: Generates heat; inefficient; short life with over-voltage; reduced output with under
voltage; yellowish light.