What is Reflection Factor?
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Different objects reflect the light in different ways. For example, diffuse surfaces appear the same when viewed from different directions, whereas a mirror looks very different from different points of view!
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Reflection factor is a ratio of luminous flux reflected by a body (with or without diffusion) to the flux it receives .i.e.
Reflection factor = luminous flux reflected by a body / luminous flux received by the body
The ratio of the total amount of radiation, as of light, reflected by a surface to the total amount of radiation incident on the surface.
In other words, it is the fraction of radiant energy that is reflected from a surface.
Some symbols used for reflection factor are:
rc= Reflection factor of ceiling.
rw = Reflection factor of parts of the wall between the working surface and the luminaires.
rf= Reflection factor of floor.
Light reflecting factors of commonly used materials:
|Aluminum, pure, highly polished||80 – 87|
|Aluminum, anodised, matt||80 – 85|
|Aluminum, polished||65 – 75|
|Aluminum, matt||55 – 75|
|Aluminum coatings, matt||55 – 56|
|Chrome, polished||60 – 70|
|Vitreous Enamel, white||65 – 75|
|Lacquer, pure white||80 – 85|
|Copper, highly polished||70 – 75|
|Nickel, highly polished||50 – 60|
|Paper, white||70 – 80|
|Silvered mirror, behind glass||80 – 88|
|Silver, highly polished||90 – 92|
|Oak, light polished||25 – 35|
|Granite||20 – 25|
|Limestone||35 – 55|
|Marble, polished||30 – 70|
|Plaster, light||40 – 45|
|Plaster, dark||15 – 25|
|Sandstone||20 – 40|
|Plywood, rough||25 – 40|
|Concrete, rough||20 – 30|
|Brick, red||10 – 15|
|Paint, white||75 – 85|
|Paint, medium grey||25 – 35|
|Paint, dark blue||15 – 20|
|Paint, light green||45 – 55|
|Paint, dark green||15 – 20|
|Paint, light yellow||60 – 70|
|Paint, brown||20 – 30|
|Paint, dark red||15 – 20|