harlan wyton lighting survey

Harlan Labs- Wyton Lighting Audit

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NAME: Mir Ali

Date: July 2012

Project No. 12027

Rev R1


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1 Contents 1.1 Executive Summary .................................................................................................................... 3

1.2 Current Situation ......................................................................................................................... 4

1.3 LED Proposal ................................................................................................................................. 4

1.4 Office / Admin / Ware house / Maintenance areas ....................................................... 5

1.5 Barrier / Production areas ...................................................................................................... 7

Intelligent Lighting Controls ............................................................................................................... 9

1.6 Maintenance Savings ................................................................................................................. 9

1.7 Conclusions: ............................................................................................................................... 10


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1.1 Executive Summary

Harlan Labs, Wyton had advised EECO2 to review the existing lighting at site and come up with a proposal

for upgrading the existing T8 Fluorescent light fittings to new energy efficient fittings in recognition of

increased policy compliance legislation, operational cost optimisation and a continuing business driver to

deliver improved building operational performance.

This Follows the European ban of certain types of incandescent light bulbs; fluorescent tube lighting has

now come under review. Standard T8 fluorescent tubes are being phased out, with production being

halted and the importation of them being banned as part of the EU’s Energy-Related Product (ErP)

Directive designed to reduce CO2 emissions across Europe.

Harlan Labs, Wyton have initiated this study in order to review the efficacy of the existing lighting system

with a view to make a strategic investment to comply with current / future legislation and also to reduce

energy consumption at site.

The entire site was surveyed in order to review the lighting installation at site, access to the barriers was

made available and have been included in the assessment. It was noted that the site had been proactively

changing the existing T8 light fittings to T5 light fittings in order to conserve energy.

Lighting at site have been divided into two areas namely the production areas where lighting is on 18

hours (tracks kept on during night) and the Office / Admin areas which follow an 8-6 working 7 days a

week to ensure production. As drawings for the site were unavailable, we have not been able to carry out

a dialux calculation of the areas, we have looked at carrying out a retrofit by replacing the existing 5ft T5

twins and other assortment of light fittings at site to be replaced with energy efficient LED light fittings,

while this might provide a rudimentary assessment, it is recommended that a detailed lighting design be

carried out in order to evaluate the best light fitting suitable for the area, it is likely to result in additional

energy savings.

Based on the calculations it would appear that there is an energy reduction figure of a 57 % reduction in

lighting energy due to conversion from fluorescent light fittings to LED lighting, this when coupled with

intelligent PIR and daylight dimming controls would result in energy savings in excess of 70-75% from the

current consumption with a payback about 3 years.

While reviewing the lighting for the barriers, which are primarily switched on to ensure adequacy of

lighting for animal welfare. There is an energy reduction figure of a 57 % reduction in lighting energy due

to conversion from fluorescent light fittings to LED lighting, this when coupled with intelligent PIR and

daylight dimming controls would result in energy savings in excess of 70-75% from the current

consumption with a payback of less than 1.5 years.

Energy Efficient lighting also reduce the amount of internal gains thereby reducing cooling energy at site.

The site is looking at adding cooling in order to meet regulatory compliance, this lighting upgrade would

result in reducing the size of the proposed new cooling plant, thereby reducing initial CAPEX needed

including reduced operational costs.


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Lighting energy accounts for a large part of the electrical energy at site, hence any savings made would

have a bearing on the site electrical consumption.

The assessment is based on a retrofit due to lack of drawings at site, we would recommend that a proper

Dialux calculation be carried out in order to properly design the lighting system at site which would

require lesser light fittings than assessed resulting in increased energy savings and improved payback

periods.

1.2 Current Situation

The client had advised us to carry out a lighting survey for the site, during the survey it was noted that the

Light fittings at site consists of predominantly T5 Lighting for the barriers, while the Office and Admin

areas had a combination of T5 light fittings and 4X18 Watt 600X 600 light fittings in the corridors and

offices with a manual light switching system providing lighting to the Offices and barriers.

A Lux measurement at site showed that lighting in some offices meets the CIBSE minimum recommended

Lux levels in Offices is 300-550 Lux. Some offices had Lux levels in excess of 700 Lux resulting in excessive

glare, it was noted that natural day lighting is not being managed properly with no means of saving

energy due to beneficial day lighting. Lux measurements were carried out in the barrier offices, stores and

barriers which were between 450-700 Lux.

1.3 LED Proposal

Due to the recent change in legislation following the European ban of certain types of incandescent light

bulbs. Standard T8 fluorescent tubes are being phased out, with production being halted and the

importation of them being banned as part of the EU’s Energy-Related Product (ErP) Directive designed to

reduce CO2 emissions across Europe.

A desktop exercise was carried out to carry out a retrofit to replace the T5 light fittings with Ultra low

energy LED light fittings (30w). A Dialux program could not be carried out due to lack of scaled site

drawings. LED lighting are increasing being used in animal care facilities, cleanroom environment with

good results, and are in fact desirable due to reduced mean time between failure (MTBF) and reduced

maintenance requirement.


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The site has been divided into the Office areas and the production areas based on hours of working.

Office areas have been calculated based on an 8-6 PM operation while the barriers have been calculated

at 18 hours.

1.4 Office / Admin areas

Energy consumed by current lights

Light Type Quantity Watts Total W Per Hour

T5 5ft 23 35 805

Total 805

Energy Consumed by new Efficient LED Lights


LED T5 5ft 23 15 345

Total

345

Reduction in Lighting Energy: 57%

Lighting Energy savings

Day Monday Tuesday Wednesday Thursday Friday Saturday Sunday Total

Hours 10 10 10 10 10 10 10 70

Hours Per Annum 3,650

Electricity prices based on 12.5p / KWHr

Year Year 1 Year 2 Year 3 Year 4 Year 5

Percentage Change 0.03% 0.03% 0.03% 0.03%

Price per KWh £0.125 £0.1287 £0.1326 £0.1367 £0.1406

Electricity prices based on 12.5p / KWHr, with a year on inflation of 3% have been used in the assessment.


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Cash Flow Analysis:

Cash Flow (annual) Year 1 Year 2 Year 3 Year 4 Year 5

Initial Investment (Minus)

£ 1,035.00 £ 554.42 £ 295.25 £ 29.59 £ 242.75

Cooling Savings (Add)

£ - £ - £ - £ - £ -

Energy Savings (Add)

£ 209.88 £ 216.17 £ 222.66 £ 229.34 £ 236.22

Maintenance Savings (Add)

£ 20.00 £ 20.00 £ 20.00 £ 20.00 £ 20.00

Sensor Saving

£ 23.00 £ 23.00 £ 23.00 £ 23.00 £ 23.00

*ECA Saving (Add)

£ 227.70 £ - £ - £ - £ -

Cash Flow

-£ 554.42 -£ 295.25 -£ 29.59 +£ 242.75 +£ 521.97

* Enhanced Capital Allowance is a cash flow benefit

Return on Investment / Payback period: Payback period of 3.5 years. By incorporating

intelligent lighting controls with PIR sensors and daylight dimming, this could be reduced to a 3 year

period.

1 2 3 4 5

Cash Flow Analysis -£554.42 -£295.25 -£29.59 £242.75 £521.97

-£800.00

-£600.00

-£400.00

-£200.00

£0.00

£200.00

£400.00

£600.00

Cash Flow Analysis


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1.5 Barrier / Production areas

We have conservatively estimated that the T5 lighting at site are the High Efficiency Lighting, the

higher output range have in some cases an energy consumption of more than double of the High

efficiency range.

Energy consumed by current lights

Individual Lights Quantity Watts Total W Per Hour

T5 4ft 9 28 252

T5 5ft 704 35 24640

T5 6ft 357 42 14994

600x600 panel 22 86 1892

Total 41778

Energy Consumed by new Efficient LED Lights


Pebble LED T5 4ft 9 13 117



600x600 Pebble LED Panel 22 30 660

Total

17763

Reduction in Lighting Energy = 57.5%

Lighting Energy savings

Day Monday Tuesday Wednesday Thursday Friday Saturday Sunday Total

Hours 18 18 18 18 18 18 18 126

Hours Per Annum 6,552

Electricity prices based on 12.5p / KWHr

Year Year 1 Year 2 Year 3 Year 4 Year 5

Percentage Change 0.03% 0.03% 0.03% 0.03%

Price per KWh £0.125 £0.1287 £0.1326 £0.1367 £0.1406

Electricity prices based on 12.5p / KWHr, with a year on inflation of 3% have been used in the assessment.


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Cash Flow Analysis:

Cash Flow (annual) Year 1 Year 2 Year 3 Year 4 Year 5

Initial Investment (Minus) £56,495.00 -£12,338.54 £20,010.27 £52,998.97 £86,646.75

Cooling Savings (Add) £9,861.12 £9,861.12 £9,861.12 £9,861.12 £9,861.12

Energy Savings (Add) £19,722.32 £20,313.99 £20,923.41 £21,551.11 £22,197.64

Maintenance Savings (Add)

£1,158.00 £1,158.00 £1,158.00 £1,158.00 £1,158.00

Sensor Saving £986.12 £1,015.70 £1,046.17 £1,077.56 £1,109.88

*ECA Saving (Add) £12,428.90 £ - £ - £ - £ -

Cash Flow Analysis -£12,338.54 £20,010.27 £52,998.97 £86,646.75 £120,973.39

* Enhanced Capital Allowance is a cash flow benefit

Return on Investment / Payback period: Payback period of 1.5 years. By incorporating

intelligent lighting controls with PIR sensors and daylight dimming, this could be reduced to less than 1

year period.

Note: This assessment is based on a like for like retrofit; we have not been able to procure any site

drawings to allow us to carry out a dialux calculation. We would advise that a full design be carried out as

part of the lighting upgrade project in order to fully evaluate the best light fitting to suit the application,

which could result in fewer light fittings and lesser energy consumption.

1 2 3 4 5

Cash Flow Analysis -£12,338.54 £20,010.27 £52,998.97 £86,646.75£120,973.39

-£20,000.00

£0.00

£20,000.00

£40,000.00

£60,000.00

£80,000.00

£100,000.00

£120,000.00

£140,000.00

Cash Flow Analysis


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Intelligent Lighting Controls

Energy Efficient Lighting can provide up to 60% reduction in lighting energy consumption, incorporating energy efficient lighting controls can improve it further to up to 40-45% reduction in electrical lighting energy consumption. This also has an added effect of reducing internal gains of the building thereby reducing the demand for cooling. As these areas have cooling, they can benefit from reduced cooling demands.

It has been noted that traditionally heating systems have always been over designed, sensible gains through lighting have traditionally been ignored whereas cooling has always been considered at a premium. Heating loss due to energy efficient lighting has thus not been considered in our assessment.

it is beneficial to reduce internal gains as it helps provide spare cooling capacity for future proofing where additional equipment can be added hence have been considered in the assessment.

1.6 Maintenance Savings

The maintenance savings are based upon the MTBF of the existing lights versus the new LED lights. Our calculations show a maintenance saving of £1,184 per annum for the whole site although it is believed to be a pessimistic view. This figure includes procurement and replacement of light fittings for the whole site.


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1.7 Conclusions:

The current lighting system meets the CIBSE LG 7 criteria of 300-500 Lux for office based tasks. In order to

keep up with upcoming legislation, it is recommended that the existing T5 light fittings be replaced with

LED light fittings, this would result in a substantial reduction in energy consumption with added benefits

in reduced maintenance due to higher lives of these light fittings and reduction in cooling demand due to

lower sensible gains due to lighting. As the site is currently looking at adding cooling to meet regulatory

compliance, incorporating LED lighting would assist in lowering the cooling capacity needed at site, hence

reducing initial CAPEX required for the cooling plant.

This would result in an energy reduction figure of a 60% reduction in lighting energy due to conversion

from fluorescent lighting to LED lighting, when coupled with intelligent PIR and daylight dimming controls

would result in energy savings in excess of 70-75% from the current consumption.

harlan wyton lighting survey

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