Electrical Breakfast ClubLighting FundamentalsBy: Hilmi Tannous

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LumensCandelasIlluminanceLuminancePrinciples of Optics

Lighting Fundamentals

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The measure of the total power of light emitted in all directions

The flow of light from a lamp or light fixture

Efficiency= Lumens out of fixture/ Lumens produced by lamp

Lumens

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It is power emitted by a light source in a particular direction.

It is the SI base unit of luminous intensity.

A common candle emits light with a luminous intensity of roughly one candela

Candela

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It is the light that strikes a surface.

It is known as Foot-Candles

Footcandle=lumen/sq.ft

In Canada it is known as Lux= lumen/sq.meter

One Footcandle ≈ 10.764 lux

Illuminance

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FC can be measured using a FC Meter.

FC can be calculated using Photometric programs like AGI32, Visual, or manually.

We use FC in design to meet Codes, Client Criteria's.

IES (Illuminating Engineering Society of North America) Standards.

Illuminance

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It is the light that is reflected from or emitted through a surface.

It is known as Brightness

Reflectance material and color affects the luminance

Luminance

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Why is Luminance so important?

It is what we see!!!!

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Reflection

Refraction

Principles of Optics

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It is the change in direction of the light after striking a surface

Types of Refraction Specular Spread Diffuse

Reflection

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Light Fixtures/Lamps have reflectors.

It is used for indirect lighting.

It is used for wall washers

Reflection

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Light bends passes from one medium to another.

Light fixtures with lenses have refractors.

Refractor Materials Glass Plastic

Refraction

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