Technical Specification - UNDP

3rd)
Gantry Sign Lighting Requirements
- The gantry sign lighting shall be as per CIE No. 35 (TC-4.6) 1978,
and shall have a maintained average luminance of 180 candelas per
square meter (for white letters) and the ratio of the maximum
luminance of one color in a specified area to the minimum
luminance in the same area shall not exceed:
2.5 for the inner zone of each area with a definite color;
5 for the outer zone of each area with a color; and
8 over the total area of the sign face.
Whereas the inner area shall be that area bounded by a similar rectangle of length
and height equal to 70% of the overall length and height of the rectangular area
located symmetrically within the sign.
- The maintained average luminance value are to be based upon the
total of lantern dirt depreciation factor and a lamp lumen
depreciation factor of 0.65.
17.11 Lamps
The lamps required shall comply with the following:
Table 10.11.1
Street Lighting Lamps
Type
-High Pressure
Mercury
Vapour
Power into
Lamp (Watt)
125
250
400
Total Luminous
Flux (lm)
6,400
15,500
23,000
Lamp
Base
E27
E40
E40
Life Time
(Min. Values)
16,000
16,000
16,000
High Pressure
Sodium
Rapid
Start
HG
TLD
Tube
Light
70
150
250
400
1000
7,000
16,000
27,000
48,000
130,000
E27
E40
E40
E40
E40
24,000
24,000
24,000
24,000
24,000
58 5,200 G13 12,000
Remarks:
1. The high pressure mercury vapor lamps shall be milky white color.
2. The high pressure sodium lamps shall be clean tubular type and golden
color.
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