Le ds are better than incandescent & cfl bulbs
Maintenance-Lighting Presentation
1. Electrical Lighting, how things
change
Alan Collick
Electrical Projects Engineer
Some images from Thorlux Lighting
2. The early days
Thomas Edison patented
the first reliable incandescent
electric lamp in 1879.
Nothing much changed since then
but they have be phased out for
more energy efficient types.
3. Fluorescent Tubes
These have developed over the years and have become
more efficient and with better quality of light.
4. High Maintenance
We replace approx 6000 lamps
of all types per year across the
sites at a cost of £15000 per
year(estimate).
5. Environmental issues
Fluorescent tubes are very environmentally unfriendly as
they contain Mercury and other chemicals and have to be
disposed of by a specialist company, this costs us approx
£2500 per year.
6. And now the 21st Century
In the last few years LED lighting technology, reliability
and most importantly costs have improved massively
to make them a viable solution for many areas.
7. Office Lighting
LEDs – case study
*Based on 4000 burning hours per annum and 10 pence per kW/hr Electricity tariff
Saving £7,746.00
Payback 1.5 Yrs
Luminaire Qty Circuit
Wattag
e
Total
Circuit
Watts (kW)
Annual
Power
Consumptio
n (kW)
Runnin
g Cost
per
annum
Total
Luminair
e Cost
Maintenanc
e Costs
10 Year Life
Cycle Cost
4x14W T5 36 62 2.2 8.92 £892.80 £3,600.00 £4,968.00 £17,496.00
28W LED 36 33 1.2 4.75 £475.00 £5,000.00 £0.00 £9,750.00
8. Changing to LED at ARU
We have changed some areas of Cambridge and
Chelmsford
Helmore music
recital area
10. Versatile control is available
“Smart” control systems are available, such as in our office
in Cambridge, which have in-built presence and light level
sensors to dim or turn off lighting when not needed
11. Big project on the horizon
Peter Taylor House
A likely investment of
approx £150,000 to
replace the lighting
corridors and kitchens.
