In this category, the calculated
luminance of a luminaire above 55° elevation should not exceed 200cd/m at
all angles of azimuth. This specification is intended for areas where there is
a high density of screens and where terminal usage is sustained over long periods
or is of an intensive nature. A typical example of where this specification may
be required is a dealers room.
CATEGORY 2 Angle of louvre cut off =65
In this category the limiting
angle is 65° elevation above which the calculated luminaire should not exceed
200cd/m at all angles of azimuth. This category of luminaire should be used in
areas where there is fairly widespread usage of VDTs, maybe one per desk
for general usage or a few terminals used continuously.
3 Angle of louvre cut off
= 75 Degrees.
The specified limiting angle for this category
is 75° above which the calculated luminance should not exceed 200cd/m at all
angles of azimuth. These luminaires may be used in areas where the density of
VDTs in an area is relatively low and usage is casual.
- PLASTIC LIGHTING DIFFUSERS In order to comply with the latest regulations
relating to flame spread over the ceiling surface, the selection of diffusers
for recessed luminaires, which form part of the ceiling, is very important. REGULATIONS
AFFECTING USE OF DIFFUSERS - Printable Pdf 11Kb
angular distance, measured along horizon, of object from north or south points.
(CD) The SI unit of luminous intensity, equal to one lumen per steradian.