In the case of the conventional parabolic reflectors clearly defined light radiation - and effective glare limitation - is only possible for exact, point light sources. When using larger radiating sources, e.g. compact fluorescent lamps, glare will occur above the cut-off angle; glare is visible in the reflector, although the lamp itself is shielded. By using reflectors with a variable parabolic focal point (so-called darklight reflectors) this effect can be avoided; brightness will then only occur in the reflector of larger radiating sources below the cut-off angle, i.e. when the light source is visible.