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LOR of the light fitting is the ratio of the light fitting's output lux, measured using practical real life distribution considerations, to the bare lamp output. But:
The LOR has 2 components, ULOR and DLOR. The output lux distribution.
U = upward component.
D= downward component.
The LOR is a measure of:
1. overall efficiency of the light fitting. Reflector and diffuser losses lower the efficiency. lamp type and optimum positioning balances the 2 losses.
2. An important consideration for lighting is the design of light distribution. ULOR higher values can help reduce glare, depending upon floor/ wall finish and mounting height. Equally, high values of DLOR cause high contrast and maybe glare.
There is because of these considerations, difficulty in using the term efficiency,
but rather the better term is effectiveness ( efficacy ). This is particularly important with say a bare fluorescent tube ( batten ) vs the light fitting with a simple reflector, where DLOR is the most important factor ( task lighting )
regards,
grahame arnold
Wiki User
∙ 11y ago
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