Knowledge base

Amount of light (luminous energy, Q)

Luminous quantity (Q) is a measure of the total light emitted from a light source over a given period. It is the...

Read more

Obie light (eye light)

Obie lighting refers to a technique used in film and video production to create a light reflection in an actor's eyes ,...

Read more

One-K lamp

One-K is a term often used in theatrical and film lighting , and refers to a specific type of bulb with an...

Read more

Nit (nt)

The nit (abbreviated nt) is a unit of luminance , which describes the amount of light per unit area. It is equal...

Read more

Lighting Effectiveness Factor (LEF)

The Lighting Effectiveness Factor (LEF) is a measure of the efficiency and effectiveness of a lighting system , taking into account the...

Read more

Lighting Cooling Index (LCI)

The Lighting Cooling Index (LCI) is a measure of the coolness of a light source. This index helps determine the color temperature...

Read more

Luminaire Dirt Depreciation (LDD)

Luminaire Dirt Depreciation (LDD) is a factor that takes into account the decrease in light output due to dirt, dust and the...

Read more

Light Loss Factor (LLF)

The Light Loss Factor (LLF) is a correction factor that accounts for the loss of light output over the life of a...

Read more

Maximum Overall Length (MOL)

The Maximum Overall Length (MOL) is the total length of a lamp , measured from the very tip of the lamp (e.g....

Read more

Light Center Length (LCL)

The Light Center Length (LCL) is the distance from the center of the light source to the base of the lamp ....

Read more

Klieg lamp

A Klieg lamp is a powerful carbon arc lamp originally used in the film industry for lighting during filming. The lamp is...

Read more

Koschmieder's law

Koschmieder's law describes the relationship between visibility and the atmospheric extinction coefficient. This law states that visibility is inversely proportional to the...

Read more