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
	Type Luminaire style here	Type New Luminaire style here
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

Nominal	Lamp	Actual
28 W	1200mm T5	30 W
54 W	1200mm T5	58 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*