Part L – The Directors Cut

Fagerhult Lighting – 24 February 2011

Liz Peck MS c MS LL

• Part L

– Who d e cid e s the m

– 201 0 in d e tail

– Flaws

– Am b igu ity

• E ne rgy Is sue s

• The Future

Building Regulations

• U K G ove rnm e nt

– S e cre tary of S tate

• Bu ild ing Act 1 984

• (b) furthe ring the conse rvation of fue l and powe r

• D e partm e nt of C om m unitie s and Local

G ove rnm e nt (D C LG )

• www.com m unitie s .gov.uk

Part L Documents

Part L2 : Non-Domes tic

Part L2 : Lighting efficacy

Part L2 : Controls

* Local Manual: Distance from switch to luminaire <6m or twice room heightWindow luminaires should be switched separately

Cell Office

Open Plan

Meeting Room

Store / WC

Corridor

Retail

Part L2 : Enhanced Controls

Part L2 : Metering

Part L2 : F laws

• O ffice , Ind ustrial, S torage

– T5 lum inaire

• 60 Llm /cW

– E m pty O ffice at 2am

• Manual switch le ft on

PART L2 COMPLIANT !!

Part L2 : F laws

• G e ne ral Are as

– T5 lam ps

• 80-1 00 lm /W

– Black box

• LO R 0%

PART L2 COMPLIANT !!

Part L2 : Ambiguity

Energy Is s ues

(b) furthering the conservation of fuel and power…

Dwindling Energy S upplies

Why S ave Energy?

Carbon Reduction Commitment

• 80% re d uction in C O2 by 2050

– 66% of 2050 bu ild ing s tock alre ad y e xis ts

– 26 m illion bu ild ings e xis t tod ay

– 1 8 m illion will ne e d re furb is hm e nt

– 500,000 e ve ry ye ar

50 buildings every hour

LENI (EN15193)

• L ighting

• Ene rgy

• Num e ric

• Ind icator

kWh/m /year ²

LENI (EN15193)

• Ins talle d powe r

• Paras itic powe r

• Lighting controls

• D aylight contribution

• O pe rating hours

• U se ful floor space

LENI (EN 15193)

LENI = W ( total power consumed in kWh)

A ( total us eful floor area in m2)

Note : W = WL (lighting load) + WP (parasitic load)

WL = {(Pn x FC) x [(tD x FO x FD) + (tN x FO)]} / 1000

WP = {{PPC x [ty – (tD + tN)]} + (Pem x te)} / 1000

Lighting Load

• PN Total power of the illumination luminaires [W]

• A Area under cons ideration [m2]

• FC Maintenance link for cons tant illuminance benefit factor

• FD Daylight link benefit factor

• FO Abs ence link benefit factor absence during operating time

• tD Operating time with daylight availability [hrs ]

• tN Operating time with no daylight availability [hrs ]

Paras itic Load

• Pem Total charge power for emergency lighting luminaires [W]

• PPC Total s tandby power for the lighting controls [W]

• te Operating time for charging emergency lighting batteries

[hrs ]

• ty S tandard hours in a year [8760 hrs ]

Tertiary Lighting S ectors

• O ffice

• Ind ustrial

• H e althcare

• E d ucation

• R e tail

• S port

Be nchm arking

E stim ation

Valid ation

Lighting for People

The right l ight

In the right place

At the right time

Thank you

liz.peck@lpa-lighting.com