| English | German |
| diffuse reflection factor | Remissionsfaktor (the ratio of the luminous flux reflected diffusely from a surface to the total luminous flux striking the surface) |
| reflection factor | Reflexionskoeffizient (defined as the ratio of the luminous flux reflected by the surface to the luminous flux incident on it) |
| reflection factor | Reflexionsgrad (defined as the ratio of the luminous flux reflected by the surface to the luminous flux incident on it) |