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Building Regulations - the Effect on Lighting Design
BUILDING REGULATIONS Part L2A - (New Buildings Other
Than Dwellings)
Summary
The intention of these Approved Documents is to
introduce measures which will focus the design in relation to energy
conservation. In all cases, the building will have a PREDICTED rate
of carbon emission and a TARGET rate. The predicted must not exceed
the target. The design team will have to use a standard modelling
device to ratify the performance of the building.
Part L2A
The effect on lighting is summarised below, it covers general
lighting efficacy targets in office, industrial and storage areas in
all building types. (Offices encompass all desk based tasks
including school classrooms, seminar and conference rooms).
Target Initial Efficacy (TIE):- 45 luminaire-lumens/circuit-watt
minimum over whole area.
Calculation (assuming no controls)
LL – lamp lumens @ 100 hours
LOR – luminaire light output ratio
CW – luminaire circuit power
N – number of luminaires
Another way of considering the calculation is to
compare the LOR of an individual luminaire to the LOR which would be
needed to achieve the prescribed minimum efficacy (see typical
tables below). Provided the luminaire has an LOR greater than that
tabulated for the lamp configuration, then the scheme would comply.
For each luminaire
Examples of LOR that meet TIE criteria of 45,
50 & 55 ll/cw with HF gear
TL 5 Lamps
TLD Triphosphor Lamps
TCL Lamps
TCD/TCT Lamps
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