Session 6 What is Light? · Light - Session 6 - 10th October 2016 UF = utilisation factor, an allowance for the light distribution of the luminaire and the room surfaces. MF maintenance

Light - Session 6 - 10th October 2016

LightSession 6

What is Light?


The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye. Electromagnetic radiation in this range of wavelengths is called visible light or simply light. A typical human eye will respond to wavelengths from about 390

to 700 nm

Visible Light


The light we see is measured in a number of different ways

Measuring Light


It is measured in....

Measuring Light


International System of Units

A system of physical units ( SI units ) based on the metre, kilogram, second, ampere, kelvin, candela, and mole.

Measuring Light


International System of Units

A system of physical units ( SI units ) based on the metre, kilogram, second, ampere, kelvin, candela, and mole.

Measuring Light

Lumens

Candelas

Candelas per metre sqaured

Lumens per metre squared


LUMINOUS FLUX

(Lm = Lumens)

Light

The Luminous Flux is energy.

The energy is the total amount of light energy radiated from a light source in all directions.

The luminous flux is measured in lumens and is the parameter used to describe the

“brightness” of a light source.


LUMINOUS INTENSITY

(cd = Candelas)

The luminous intensity of a light source is the power of light

It is defined in a given direction and is measured in candela, cd.

The candela is one of the seven base units of the SI system and specifies the luminous intensity in one specific angle from a light

source

Light


ILLUMINANCE

(Lm/m2 = Lumens per metre squared)(Lux)

Illuminance is invisible! It is light passing through space and not seen unless you look at the source or a surface it

reflects off.

In other words we can only see “luminance”

The illuminance or light level is the amount of light energy reaching a given point on a

defined surface area.

Namely the luminous flux (i.e. lumens) per square meter.

Light


LUMINANCE

(cd/m2)

Luminance is the amount of light energy emitted or

reflected from an object in a specific direction.

Luminance is the only form of light we can see.

Luminance is the unit which relates to the perceived

brightness of a given object.

Light


Visible Light


Calculating Perceived Light

The Lumen Method

The lumen method is a simplified method to calculate the light level in a room.

The method is a series of calculations that uses horizontal illuminance criteria to establish a uni-form luminaire layout in a space.


N = number of lamps required.E = illuminance level required (lux)A = area at working plane height (m2)F = average luminous flux from each lamp (lm)UF = utilisation factor, an allowance for the light distribution of the luminaire and the room surfaces.MF = maintenance factor, an allowance for reduced light output because of deterioration and dirt



UF = utilisation factor, an allowance for the light distribution of the luminaire and the room surfaces.MF = maintenance factor, an allowance for reduced light output because of deterioration and dirt


The utilization factor or use factor is the ratio of the time that a piece of equipment is in use to the total time that it could be in use.

This maintenance factor takes into account the reduction of luminous flux due to the soiling of the luminaire.


N = number of lamps required.E = illuminance level required (lux)A = area at working plane height (m2)F = average luminous flux from each lamp (lm)UF = utilisation factor, an allowance for the light distribution of the luminaire and the room surfaces.MF = maintenance factor, an allowance for reduced light output because of deterioration and dirt


number of lamps required =

illuminance level required

200 luxarea at working plane height (5m x 5m)

25m2X

average luminous flux from each lamp100lumens

utilisation factor

0.6XMaintenance factor

0.8X





200 lux X

average luminous flux from each lamp600lumens X X

utilisation factor

0.6Maintenance factor

0.8

area at working plane height 5m x 5m

11000

288= 38.19

= 38 lamps required

=



Find the number of lamps required if each lamp has a light output 18,000 lumens.

An art gallery measures 60 metres x 24 metres.

The illumination required for the gallery area is 200 lux.

Utilisation factor = 0.4

Lamp Maintenance Factor = 0.75

Your go.....N = number of lamps required.E = illuminance level required (lux)A = area at working plane height (m2)F = average luminous flux from each lamp (lm)UF = utilisation factor, an allowance for the light distribution of the luminaire and the room surfaces.MF = maintenance factor, an allowance for reduced light output because of deterioration and dirt



Your go.....



200 lux X

average luminous flux from each lamp18,000lumens X X

utilisation factor

0.4Maintenance factor

0.75

area at working plane height 60m x 24m

28000

360= 53.3

= 54 lamps required

=


Less Tech more concept..

PH Loop - http://loop.ph/

Jason Bruges - http://www.jasonbruges.com/

Speirs & Major - http://www.speirsandmajor.com/

Lighting design Collective - http://www.ldcol.com/

United visual Artists - https://uva.co.uk/

Heatherwick Studios - http://www.heatherwick.com/



http://www.dezeen.com/2016/09/20/anya-hindmarch-spring-summer-2017-collection-amphithe-atre-catwalk-london-fashion-week/

http://www.dezeen.com/2016/09/19/lee-broom-opticality-installation-optical-light-london-de-sign-festival-2016/

http://www.dezeen.com/2016/09/16/benjamin-hubert-foil-vanda-braun-tapestry-light-installation/



A giant illuminated disk hung above a set of circular steps to form the set for designer Anya Hindmarch’s collection during this season’s London Fashion Week.









50,000 metal triangles make up British designer Benjamin Hubert’s undulating Foil installation, which casts light onto the V&A’s medieval tapestries



http://www.dezeen.com/2016/09/16/benjamin-hubert-foil-vanda-braun-tapestry-light-installation/

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Session 6 What is Light? · Light - Session 6 - 10th October 2016 UF = utilisation factor, an allowance for the light distribution of the luminaire and the room surfaces. MF maintenance