Abstract: A non-glare screen is assembled of prismatic rings stacked one on the other and coaxially enclosing a light emitting surface. Each ring has a cross-section of a right triangle. One leg of the triangle is perpendicular to the axis of the light emitting surface and the hypoteruse forms with the one leg an angle between 35.degree. to 45.degree., preferably 40.degree..
Abstract: A lamp includes a housing in which a wiring and a switching circuit are accommodated. A linear light source, which can be a hot cathode lamp or a cold cathode lamp, is located outside the lamp and is at least partially accommodated in a recess provided in the lamp housing and opened outwardly.