Page 31 - GRIHA Manual Volume III - Introduction to National Rating System
P. 31
24 GRIHA Manual: Volume 3
Inference: In this case, it can be inferred that the window specifications need to be modified to allow
adequate daylight and qualify for the mandatory clause of GRIHA. In case of office buildings, the
requirement for daylight factor is 1.9. In case of Jaipur, this works out to be a minimum daylight level
of (11000 × 1.9 =) 209 lux. Thus, the current design does not meet the GRIHA stipulations.
Artiicial lighting design
To comply with GRIHA specifications, artificial lighting design should be effective as well as efficient.
The effectiveness of lighting design is measured through its visual comfort, while efficiency is
measured through its level of energy consumption. The artificial lighting clause of GRIHA directly
demands for lighting simulation to demonstrate that the lighting levels meet the recommended
levels in NBC-2005. Though GRIHA mandates the lighting level as per NBC, but at the same time it
also recommends to meet the lighting power density benchmark prescribed by ECBC-2007.
Efficient Artificial Lighting Design
Visual comfort Energy efficiency Day light controls
(Mandatory) (Prescriptive) (Mandatory)
Not to exceed ECBC As per
Meet NBC 2005 2007 recommended ECBC 2007
recommended
lighting power
lighting level (Lux) density (W/m )
2
Figure 17 Schematic diagram showing steps for eficient artiicial lighting design
1. Recommended values of illuminance
The basic aim of effective lighting design is to achieve visual comfort for the occupant as per the
recommended values of illuminance in NBC-2005, part 8, Building Services, section 1: lighting and
ventilation, table 4. This standard demonstrates general requirements of lighting levels related to
occupants and buildings. These are valid under most conditions, whether the illumination is by
daylighting, artificial lighting or a combination of the two. Some of the categories of spaces that
GRIHA addresses are as follows.
1. Offices
2. Schools
3. Public buildings
4. Hospitals
Inference: In this case, it can be inferred that the window specifications need to be modified to allow
adequate daylight and qualify for the mandatory clause of GRIHA. In case of office buildings, the
requirement for daylight factor is 1.9. In case of Jaipur, this works out to be a minimum daylight level
of (11000 × 1.9 =) 209 lux. Thus, the current design does not meet the GRIHA stipulations.
Artiicial lighting design
To comply with GRIHA specifications, artificial lighting design should be effective as well as efficient.
The effectiveness of lighting design is measured through its visual comfort, while efficiency is
measured through its level of energy consumption. The artificial lighting clause of GRIHA directly
demands for lighting simulation to demonstrate that the lighting levels meet the recommended
levels in NBC-2005. Though GRIHA mandates the lighting level as per NBC, but at the same time it
also recommends to meet the lighting power density benchmark prescribed by ECBC-2007.
Efficient Artificial Lighting Design
Visual comfort Energy efficiency Day light controls
(Mandatory) (Prescriptive) (Mandatory)
Not to exceed ECBC As per
Meet NBC 2005 2007 recommended ECBC 2007
recommended
lighting power
lighting level (Lux) density (W/m )
2
Figure 17 Schematic diagram showing steps for eficient artiicial lighting design
1. Recommended values of illuminance
The basic aim of effective lighting design is to achieve visual comfort for the occupant as per the
recommended values of illuminance in NBC-2005, part 8, Building Services, section 1: lighting and
ventilation, table 4. This standard demonstrates general requirements of lighting levels related to
occupants and buildings. These are valid under most conditions, whether the illumination is by
daylighting, artificial lighting or a combination of the two. Some of the categories of spaces that
GRIHA addresses are as follows.
1. Offices
2. Schools
3. Public buildings
4. Hospitals
