About Lighting Knowledge(Part 1)

The performance of any light fixture depends very much on the light source (bulb) used. Different sources produce different effects. Light is measured in terms of:

Wattage: The amount of electricity consumed by a bulb.
Lumens: The amount of light that a bulb produces.
Footcandles : The amount of light reaching a subject.

Incandescent
General Service : General service bulbs are inexpensive and readily available in a variety of wattages and shapes. They produce a yellowish-white light that is emitted

in all directions. Available in either clear or frosted.

Types:
General (A)
Globe (G)
Decorative (D)
(flame, teardrop, and other shapes)

Reflective coating inside the bulb directs light forward, giving you better beam control than general service bulbs. Flood types (FL) spread light. Spot types (SP)

concentrate the light.
Reflector (R)bulbs put approximately double the amount of light (footcandles) on the subject as General Service (A) of same wattage.
Parabolic Reflector (PAR)bulbs control light more precisely. They produce about four times the light of General Service (A) and are used in recessed and track

lighting. Weatherproof casing makes them suitable for outdoor spot and flood fixtures.

For help in determining what bulbs to use in specific applications, talk to us 08139131326 or visit www.electrical.com.ng we can help you choose the best available light sources to suit your needs.