Gloss level

The gloss level of a floor is defined by the amount of light reflected in a coordinated way, that is to say the possibility to see an object by reflection on the floor. The simplest way to evaluate gloss is to use a light source ( a lamp or a window) and to verify if it is possible to see the reflection on the floor.
The more you have to go backwards ( to decrease the angle of reflection), the less your floor is glossy.
Depending on the gloss level and its homogeneity, it will be necessary to realize a treatment that is less or more important to achieve a brilliant gloss finish.

English
Intro: 

The gloss level of a floor is defined by the amount of light reflected in a coordinated way, that is to say the possibility to see an object by reflection on the floor.