## 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!

##### Must Read: Aims of Good Lighting in a House
Courtesy - 123rf

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

OR

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:
 Material Reflection Factor (%) 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

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