Lighting device

1. A lighting device, comprising:

a light radiation source board with at least one electrically powered light radiation source, a frame-like housing having a window therein,

the light radiation source board arranged in said housing with said at least one light radiation source facing said window,

and a cover of a light permeable glass material inserted in said housing and covering said window,

wherein said window is formed in a lowered portion of the front face of said housing, said front face having, in a portion surrounding said window a vat-like shape with said glass material cover arranged at the bottom, and

holes for fixing screws are formed in said housing in said portion surrounding said window.

2. The lighting device of claim 1 , wherein said glass material cover is inserted in said housing by sliding insertion along said housing.

3. The lighting device of claim 2 , further comprising a gasket coupled at a proximal position to said glass material cover for providing a sealed closure of said housing.

4. The lighting device of claim 1 , wherein said glass material cover is inserted in said housing by tilting against said housing.

5. The lighting device of claim 1 , further comprising an elastic member acting on said glass material cover by urging it in a seat formed in said housing.

6. The lighting device of claim 1 , wherein:

said frame-like housing has a front face wherein said window is provided and a back side for mounting onto a mounting surface, and

a gasket is provided on said back side for sealingly mounting said housing onto said mounting surface.

7. The lighting device of claim 1 , wherein said window and said glass material cover have a quadrilateral shape.

8. The lighting device of claim 1 , wherein said at least one electrically powered light radiation source includes a LED light radiation source.

9. The lighting device of claim 1 , wherein said window and said glass material cover have rectangular or square shape.