JCC Catalogue 30

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256 Technical
Non-Domestic/Commercial
MINIMUM LIGHT FITTING PERFORMANCE
• General lighting in office and industrial – 60 lumens per circuit Watt
• Display lighting – 22 lumens per circuit Watt
Domestic
MINIMUM LIGHT FITTING PERFORMANCE
• Internal lighting - At least 75% of all the light fittings in the main dwelling spaces (excluding infrequently accessed spaces
used for storage) must have light fittings with an efficacy greater than 45 lumens per circuit Watt and total
light output greater than 400 lumens.
- Light fittings of less than 5 circuit Watts, such as FGLED3®, are excluded from the calculation.
• External lighting
Either
- Light fitting and lamps of greater than 100 Watts must be automatically controlled to switch off after the
area becomes unoccupied and automatically controlled to switch off when daylight is sufficient.
Or
- If the light fittings are better than 45 lumens per circuit Watt then they should be automatically controlled,
so as to switch off when daylight is sufficient and can be manually controllable.
Introducing LENI (Light Energy Numeric Indicator)
LENI is a measurement of the buildings energy performance in energy usage per sq/m.
The methodology:
Divides the building into zones according to:
– Task type – and hence required luminance (see page 250)
– Daylight availability
– Annual usage
• Calculates annual all-lights-on power usage for each zone
• Discounts by applicable control factors
• Adds fixed allowance for standby power consumption
• Compares the result with the Part L allowance
For more information: and see lighting guides.
2014 Building Regulations
Part L
Combined LpcW
Day lit space with photo-switching with or without override
Day lit space with photo-switching with or without override + dimming
Unoccupied space with automatic on/off occupancy
Unoccupied space with manual on/off occupancy
Space not day lit, dimmed for constant illuminance
A
B
C
D
E
Minimum performance required from a fitting with lighting controls
Control
factor
0.90
0.85
0.90
0.85
0.90
54 51 54 51 54 48 45 45 45 42 48
LIGHTING CONTROLS WILL REDUCE THE REQUIRED EFFICIENCY OF THE LIGHT FITTING