Translation of "Lichtabfall" in English

All gas discharge lamps have a light decrease after about 2000 hours.

Because the light falls backwards, the ring lamp creates an extraordinary and characteristic plasticity.

The haze in the sky increases the waste of light and energy into the night sky.

However, the light decrease within the pulse is undesirable and leads to impairment of the picture quality.

When the terminal is stored, for example in a handbag by a user, a sudden decrease of the illumination level occurs in the vicinity of the terminal apparatus.

A further aspect of the invention is therefore concerned with reducing or compensating for the decrease in light from the centre to the edge of a projection screen 2.

This decrease in light is determined by the physical properties of the optical components, a particular contribution being made to this phenomenon by the illumination unit, and in particular the lenses of the condenser.

The free-form condenser lens can be so constructed that the decrease in light towards the edge is compensated for at least partly or almost completely by the intensity distribution being exaggerated towards the image edge by the free-form condenser lens in such a way that on the whole a virtually uniform brightness is obtained during the imaging.

Such ring systems can be detected for planets observed by the transit method by additional reduction of the light of the central star if their opacity is sufficient.

Because one of the qualities is, that you do not have a lot of fall off to the sides and to the back over here.

It has very good resolution capability, strongly reduced light fall off up to the edges, minimized chromatic aberration and very good stray light behavior.

It provides an extreme hot spot and a dramatic light fall-off, which gives a striking effect.

Very good resolution property, very decreased light rubbish to the edge, minimised chromatic aberration and improved scattered light behaviour make this objective the first choice for digital, but also analogous reflecting reflex cameras.

Unlike a softbox, where you have a large light source with a gradual fall-off and soft edges, the ProBox gives you a smaller, perfectly even edge-to-edge light surface with razor sharp edges.

In various embodiments, a control method for semiconductor light sources is proposed in which the characteristic light decrease of a semiconductor light source depending on the power introduced into the semiconductor light source is stored in the operating device, and the operating device varies the power introduced into the semiconductor light source during the pulse duration in such a way that the emitted quantity of light of the semiconductor light source substantially remains constant over the pulse duration.

By virtue of the fact that the characteristic light decrease of the light emitting diodes is stored in the control circuit, the latter can generate a predefined current value in the case of which the emitted quantity of light of the light emitting diode substantially remains constant over the entire pulse duration.

In order to comply with different current intensities and different initial temperatures, the characteristic light decrease can be stored as a family of characteristic curves in the control circuit.

In order to save storage space in the control circuit, however, it is also conceivable for the characteristic light decrease to be stored as a mathematical relationship in the control circuit, and for the predefined current value to be respectively calculated from the mathematical relationship with the aid of the relevant measurement variables.

The mirrored barndoors enable light control without significant loss of light, this system is therefore most suitable as main light and/or as natural backlight.

Control brightness and light fall-off with distance – by moving light source closer or further away.

For instance, you may want a sharp fall-off on one side and a soft, gradient fall-off on the other.

With modern digital sensors you will, however, experience a new phenomenon: typically the light beam hits the sensor very slanted in the corners of the full format (24x36 mm) sensor. Sensors using the "Bayer scheme" to arrange the pixels may be be hit so badly that in addition to the physical light falloff a shadow further darkens each pixel and cause chroma borders ("Microlens Cornershading").

Filters may also introduce physical vignetting (light fall-off or blackening at the edges of the image) if their opaque edge gets in the way of light entering the lens (right example).