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BEAM P
LUS
I
NTERIORS
C
OMMERCIAL
, R
ETAIL
A
ND
I
NSTITUTIONAL
I
NDOOR
E
NVIRONMENTAL
Q
UALITY
(IEQ)
IEQ 8
I
NTERIOR
L
IGHTING
Q
UALITY
Copyright © BEAM Society Limited. All rights reserved. Page 113
IEQ 8 I
NTERIOR
L
IGHTING
Q
UALITY
E
XCLUSION
None.
O
BJECTIVE
Ensure the adequacy and maintenance of visual comfort conditions
achieved by the electric lighting provisions in the occupied space.
C
REDIT ATTAINABLE
3
C
REDIT REQUIREMENT
3 credits where the uniformity, glare index and colour rendering index
(1 credit for each parameter) at all workstations or working zone can
comply with CIBSE requirements
[1].
A
SSESSMENT
Criteria
Compliance with the assessment criteria shall be demonstrated either
by measurements using a standardised measurement protocol
appropriate to the parameter being assessed, and/or by modelling
(calculation), providing the calculation method or software used is
based on a standardised method, and uses data/assumptions
appropriate to the circumstances.
Documentation
The Applicant shall provide the following documentation to
demonstrate compliance:
i.
summary table with uniformity, glare index and colour
rendering index (by measurements or simulations) for each
location;
ii.
drawings, layout plan showing all workstations, working zone;
iii.
site measurements;
iv.
Catalogues or other supporting documents showing that the
colour rendering index of the lighting system.
M
EASURED
P
ERFORMANCE
For lighting installations that are already installed, horizontal and
vertical illuminance and luminance can be measured using a lux
meter and a luminance meter.
The colour quality of lamps can be judged from the lamp
specifications. Colour appearance (correlated colour temperature) can
be checked from the specification provided by the suppliers.
C
OMPUTATION
The illuminance variation consists of ‘uniformity’ which is concerned
with illuminance conditions on the task and immediate surroundings,
and ‘diversity’ which expresses changes in illuminance across a larger
space.
The uniformity can be calculated according to that described in
Section 4.5.4 of the Code. The calculated uniformity (minimum to
average illuminance) over any task area and immediate surround
should not be less than 0.8.
The glare index can be calculated according to either of the two
methods described by CIE
[2], or the CIBSE Technical Memoranda
1
The Chartered Institution of Building Services Engineers. Code for Interior Lighting. London. CIBSE.