Page 324 - Electrician - TT (Volume 1)

ELECTRICIAN - CITS

MODULE 10 : IIllumination, Connection of Electrical
Lights

LESSON 54-59 : Illumination terms - law’s

Objectives
At the end of this lesson you shall be able to:
• state and explain different terms used in illumination
• state and explain law’s of illumination
• explain the different types of lamps
• explain the construction & working of incandescent lamp, flourescent lamp HPSV, HPMV lamp, CFL LED.

Light
Light is defined as that radiant energy which produce a sensation of vision upon the human eye.

Red 700 nm → violet 400 nm

Electrical lighting
Electrical lighting has following advantages:

1 Cleanliness
2 Easy to control
3 Economical
4 Easy to handle
5 Steady output
6 Better reliability

7 Suitable for almost all purposes etc.

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