IGES or IGS

This is one type of file format (e.g. 'Part name.IGES') used to save and exchange CAD data. Not to be confused with IES files – see above.

Illuminance

Illuminance is, in simple terms, a measure of the amount of light (in lumens) emitted from a light source onto a surface at a specific distance. The SI unit for Illuminance is Lux (i.e.

Illuminance (lx)

In photometry, illuminance is the total luminous flux incident on a surface, per unit area.

Incandescent Lamp

A light source where current passes through a filament to create heat which, in turn, creates light.

Ipk/W

Peak radiant intensity per unit watt. Used for radiometric quantities as opposed to cd/lm in photometry.

Lambertian Distribution

In optics, Lambertian Distribution of light is the distribution of diffusely reflected light which is directly proportional to the cosine of the angle θ between the direction of the incident light

LED (Light-Emitting Diode)

a solid-state semiconductor device that converts electrical energy directly into light.

Light Output Ratio

At Carclo Optics the LOR is determined by measuring the ratio of the light collected  after the Optic output face (excluding scattered light) and dividing this by all the light collected from the L

Lightguide

An optical component within which light is usually confined and guided by total internal reflection.

Lumen (lm)

Lumen (lm) is the SI unit of luminous flux, equal to the amount of light emitted per second in a unit solid angle of one steradian from a uniform source of one candela.

Luminous Flux

In photometry, luminous flux or luminous power is the measure of the perceived power of light by human eye.

Luminous Flux

Luminous Flux is defined as the total electromagnetic energy emitted by the light source into a sphere (360°) surrounding the light source.