Page 35 - GRIHA Manual Volume III - Introduction to National Rating System
P. 35
28 GRIHA Manual: Volume 3
Table 3 Eficacy comparison of different types of lamps
Lamp type Particulars Conventional ballast Electronic ballast
Tubular luorescent lamp (tri- Lamp wattage 36W 36W
phosphor) Ballast power loss 10W 4W
TL-D 36W Total power 46W 40W
Lamp lux 3250 lumen 3250 lumen
System eficacy 70 lumen/watt 81 lumen/watt
Tubular luorescent lamp(tri- Lamp wattage Not available 14W
phosphor) Ballast power loss 2W
TL5 HE 14W Total power 16W
Lamp lux 1350 lumen
System eficacy 84 lumen/watt
Tubular luorescent lamp(tri- Lamp wattage Not available 28W
phosphor) Ballast power loss 2W
TL5 HE 28W Total power 30W
Lamp lux 2900 lumen
System eficacy 97 lumen/watt
Compact luorescent lamp Lamp wattage 18W 18W
PL-C 18W (CFL) Ballast power loss 10W 4W
Total power 28W 22W
Lamp lux 1200 lumen 1200 lumen
System eficacy 42 lumen/watt 54 lumen/watt
4. Room characteristics
For efficient design of artificial lighting, room dimensions as well as colours or reflectance of
internal finish of the room have to be defined. The reflectance of floor, wall, and ceiling have been
standardized in GRIHA, as per SP41 (Handbook on Functional Requirements of Building [other than
industrial building]) and are shown in table 4.
Table 4 Relectance of common inishes and surfaces
Typical inishes of surfaces Relectance
White wash 0.7–0.8
Cream colour 0.6–0.7
Light green 0.5–0.6
Light blue 0.4–0.5
Light pink 0.6–0.7
Dark red 0.3–0.4
Medium grey 0.3
Cement terrazzo 0.25–0.35
Brick 0.4–0.5
Vegetation (mean) 0.25
Table 3 Eficacy comparison of different types of lamps
Lamp type Particulars Conventional ballast Electronic ballast
Tubular luorescent lamp (tri- Lamp wattage 36W 36W
phosphor) Ballast power loss 10W 4W
TL-D 36W Total power 46W 40W
Lamp lux 3250 lumen 3250 lumen
System eficacy 70 lumen/watt 81 lumen/watt
Tubular luorescent lamp(tri- Lamp wattage Not available 14W
phosphor) Ballast power loss 2W
TL5 HE 14W Total power 16W
Lamp lux 1350 lumen
System eficacy 84 lumen/watt
Tubular luorescent lamp(tri- Lamp wattage Not available 28W
phosphor) Ballast power loss 2W
TL5 HE 28W Total power 30W
Lamp lux 2900 lumen
System eficacy 97 lumen/watt
Compact luorescent lamp Lamp wattage 18W 18W
PL-C 18W (CFL) Ballast power loss 10W 4W
Total power 28W 22W
Lamp lux 1200 lumen 1200 lumen
System eficacy 42 lumen/watt 54 lumen/watt
4. Room characteristics
For efficient design of artificial lighting, room dimensions as well as colours or reflectance of
internal finish of the room have to be defined. The reflectance of floor, wall, and ceiling have been
standardized in GRIHA, as per SP41 (Handbook on Functional Requirements of Building [other than
industrial building]) and are shown in table 4.
Table 4 Relectance of common inishes and surfaces
Typical inishes of surfaces Relectance
White wash 0.7–0.8
Cream colour 0.6–0.7
Light green 0.5–0.6
Light blue 0.4–0.5
Light pink 0.6–0.7
Dark red 0.3–0.4
Medium grey 0.3
Cement terrazzo 0.25–0.35
Brick 0.4–0.5
Vegetation (mean) 0.25
