Profile Lighting - Building Regs Effect on lighting Design

Building Regulations - L2A Implications on Lighting Design - TL 5 - TLD - TCL - TCD - TCT Lamp Examples

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