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Energy Saving Calculator

Use our energy savings and payback calculator to help evaluate the economics of replacing old aisle lighting with modern T5 lamp technology in super-efficient reflectors.

Project name:

Electricity Supply and Production (see right)

Cost per KWh: pence.        CO2 produced per KWh: Kg.

Existing

Proposed

Luminaires per aisle:
Number of aisles:
Number of lamps per luminaire:
Individual lamp circuit power (W) (see right):
Lighting installation total power draw (KW): 0 0
Total number of luminaires: 0 0
Luminaire cost:
Installation cost per luminaire:
Outlay for lighting installation: 0

Occupancy

Hours of use per day:
Average days use a week:
Number of hours use a week: 0 0
Number of visits an hour:
Average duration of visit (mins):
Number of hours occupied a week: 0
Percentage occupancy: 100% 0
Percentage power usage at minimum output level:
0% power usage equates to OFF,
21%power usage equates to a 10% illumination level.
(see right)
Lighting Installation Energy (KWh): 0 0
CO2 consumption a year (tonnes): 0 0

Annual running cost:

0 0
Energy saving:
0%
Payback period:
0 years
Annual CO2 reduction:
0 tonnes
Annual savings:
0

Electricity supply and production

Typical electricity unit prices are:

  • 11p for low users
  • 10p for medium users
  • 9p for high users.

A figure of 0.537 Kg per kWh for CO2 generation is provided by the Carbon Trust.

Common Lamp Circuit Powers

NominalLampActual
28 W1200mm T530 W
54 W1200mm T558 W
35 W 1500mm T5 38 W
49 W 1500mm T5 53 W
80 W 1500mm T5 83 W
36 W 1200mm T8 41-45W
58 W 1500mm T8 64-70W
70 W 1800mm T8 77-83W
100 W 2400mmT12 122 W
55 W TC-L 56 W
80 W TC-L 83 W
250 W* SON* 275 W*
400 W* SON* 435 W*
250 W* M-Halide* 275 W*
400 W* M-Halide* 430 W*
400 W* Mercury* 425 W*

High pressure discharge lamps are not suitable for dimming or switching with presence detection

Percentage Light Output

% Light Output% Power Usage
100 100
90 90
80 81
70 73
60 66
50 59
40 51
30 42
20 33
10 21
3 14
1 13
0 0

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