In this presentation, we will discuss about definition of illumination, good illumination advantages, types of lighting systems , feature of good lighting scheme , illumination is what and what are the advantages of illumination /lighting .

1. ILLUMINATION INFORMATION
Presented by :
Amardeep jha

2. DEFINITION OF LIGHTING/ ILLUMINATION
 Definition of Illumination / light :- light is a form of
radiant energy from a hot body which produces a
visual sensation upon human eye sense. It is
usually denoted by Q and expressed in " lumen -
hour " which is analogies to watt-hour .

3. ADVANTAGES OF GOOD ILLUMINATION
 improvement in productivity increment with good lighting.
 good illumination increases the focus , concentration , working
place will have higher productivity.
 we can avoid accident in working places and populated area .
 In street more than 70% of road accident , because of bad
illumination or not proper lighting .
 Good lighting /illumination will avoid depression, dullness, glare
free and many problems related eye .
 in decorative purpose we should have a proper and good
illumination for better look, environmental happiness etc .
 good illumination will avoid eye strain and fatigue .
 good lighting schemes will reduces excessive brightness,
contrast, glare and disturbing glass .
 good lighting schemes will have good lighting maintenance.
 good illumination will create a good atmosphere .

4. TYPES OF GOOD ILLUMINATION SYSTEMS
Types of lighting system :-
 1. Direct lighting :-
 this is most efficient schemes of lighting .
 90 % of total light is made to fall on the working
surface or plane .
 light does not shine on ceiling .
 illumination is not uniform by this scheme because
it causes shadows and glare .
 lamp surface is easily visible to observer .
 Application :- shop, industrial , and outdoor use in
big hall area , workshop , railway station etc .

5. 2. Semi - direct lighting :-
 a bit too weak to use as a focus scheme of
lighting .
 60% of total light is made to fall directly
downwards on the working plane or surface.
 40% of total goes upward and diffused with
the help of sheds and upper walls .
 light does shine on the ceiling .
Application : Dining table , rooms with high
ceiling, gate etc.

6. 3. INDIRECT LIGHTING
 Soft reflected light .
 90% of total light is made to thrown to the ceiling
and this diffused light reflected by reflector which
fall on the working surface or plane.
 little light reaches the floor.
 illumination is uniform and glare free.
 Application :- computer rooms, software industry ,
hotels, theaters, decoration etc.

7. FEATURE OF GOOD LIGHTING SCHEME :
 To avoid adequate illumination : for different
purpose , different level of illumination are required
, that requirement shell be fulfilled.
 To avoid glare and hard shadow : disposition of
lamps and the method such direct and indirect shall
be adopted , such that hard shadows and glare on
the eye shell be avoided .
 To provide suitable light colour : different lamp
emits light of different colours, generally whitish day
light colour is desirable .
 To provide light distribution uniformly over the
working plane : Disposition of the lamp shall be
proper to achieve this objective .