The style of painting grew directly out of the Medieval arts of tempera painting, stained glass and book illumination.

" The illumination grew brighter and brighter, the roaring louder, I experienced a rocking sensation and then felt myself slipping out of my body, entirely enveloped in a halo of light … I felt the point of consciousness that was myself growing wider, surrounded by waves of light … I was now all consciousness, without any outline, without any idea of a corporeal appendage, without any feeling or sensation coming from the senses, immersed in a sea of light simultaneously conscious and aware of every point, spread out, as it were, in all directions without any barrier or material obstruction … bathed in light and in a state of exaltation and happiness impossible to describe.

Brown exists as a color perception only in the presence of a brighter color contrast yellow, orange, red, or rose objects are still perceived as such if the general illumination level is low, despite reflecting the same amount of red or orange light as a brown object would in normal lighting conditions.

Additional considerations for the tube lifespan are the environment that the tube is being used in and the general level of illumination present in that environment, including bright moonlight and exposure to both artificial lighting and use during dusk / dawn periods, as exposure to brighter light reduces a tube's life significantly.

For example, an Earth-like planet at 1. 25 astronomical units from α Cen A ( with a revolution period of 1. 34 years ) would get Sun-like illumination from its primary, and α Cen B would appear 5. 7 to 8. 6 magnitudes dimmer (− 21. 0 to − 18. 2 ), 190 to 2700 times dimmer than α Cen A but still 2100 to 150 times brighter than the full Moon.

Conversely, an Earth-like planet at 0. 71 AUs from α Cen B ( with a revolution period of 0. 63 years ) would get Sun-like illumination from its primary, and α Cen A would appear 4. 6 to 7. 3 magnitudes dimmer (− 22. 1 to − 19. 4 ), 70 to 840 times dimmer than α Cen B but still 5700 to 470 times brighter than the full Moon.

Vogt introduced Koehler illumination, and the reddish shining Nernst glower was replaced with the brighter and whiter incandescent lamp.

At the same time, halogen lamps replaced the old illumination systems to make them brighter and essentially daylight quality.

The scanning light source must be brighter than other incident illumination.

It is characterised by the same pattern of ' hot ' ( brighter ) and cold ( darker ) pixels occurring with images taken under the same illumination conditions in an imaging array.

9th century Byzantine manuscript illumination of I ConstantinopleHomilies of Gregory Nazianzus, 879-882

St. Gregory and King Chilperic I, from the Grandes Chroniques de France de Charles V, 14th century illumination.

15th century manuscript illumination of an angel sending the fleurs-de-lis to Clovis I | Clovis

" Such a penetrating -- and Zen -- mystical view, arrived at so long ago, will be hard to top ; in my own experiences with psychedelic drugs I have had precious tiny illumination compared with Erigena.

He borrowed the apparatus for me, which I took to my room, installed at my window, and with which, when conditions of illumination were right, I took the observations.

Darwin declined, writing that " though I am a strong advocate for free thought on all subjects, yet it appears to me ( whether rightly or wrongly ) that direct arguments against Christianity & theism produce hardly any effect on the public ; & freedom of thought is best promoted by the gradual illumination of men ’ s minds, which follows from the advance of science.

I am from your illumination while Adam is made of dust.

The amount and quality of sleep experienced in space is poor due to highly variable light and dark cycles on flight decks and poor illumination during daytime hours in the space craft.

Once the ray either encounters a light source, or more probably once a set limiting number of bounces has been evaluated, then the surface illumination at that final point is evaluated using techniques described above, and the changes along the way through the various bounces evaluated to estimate a value observed at the point of view.

The US natural gas industry started in 1821 at Fredonia, Chautauqua County, New York, when William Hart dug a well to a depth of into gas-bearing shale, then drilled a borehole further, and piped the natural gas to a nearby inn where it was burned for illumination.

In the Life of Moses, Gregory speaks of three stages of this spiritual growth: initial darkness of ignorance, then spiritual illumination, and finally a darkness of the mind in mystic contemplation of the God who cannot be comprehended.

The idea of the Photophone was thus to modulate a light beam: the resulting varying illumination of the receiver would induce a corresponding varying resistance in the selenium cells, which was then used to regenerate the sounds captured by the telephone receiver.

They also survived in rather crude standardized form in Byzantine art and were refined again in the Middle Ages to become standard by the early fifteenth-century in painting and manuscript illumination in Italy and Flanders, and then spread to all Western art.

* For soft indirect illumination, if the surface is Lambertian, then a technique known as irradiance caching may be used to interpolate values from previous calculations.

This illumination is then discounted in order to obtain the object's " true color " or reflectance: the wavelengths of light the object reflects.

To prevent adjacent images from creating an overilluminated vertical band where they overlapped on the screen, vibrating combs in the projectors, called " jiggolos ," alternately blocked the image from one projector and then the other ; the overlapping area thus received no more total illumination than the rest of the screen, and the rapidly-alternating images within the overlap smoothed out the visual transition between adjacent image " panels.

Secondly, the radar illumination then being downward, shadows are seen in their most-familiar " overhead-lighting " direction.

If the SAR is " squinting " forward or aft away from the exactly broadside direction, then the illumination direction, and hence the shadow direction, will not be opposite to the overlay direction, but slanted to right or left from it.

They are not transparent to X-rays, and thus if X-ray illumination through the gasket is required then lighter materials, such as beryllium, boron nitride, boron or diamond are used as a gasket.

It involves injection of sodium fluorescein into the systemic circulation, and then an angiogram is obtained by photographing the fluorescence emitted after illumination of the retina with blue light at a wavelength of 490 nanometers.

This is controlling photographic illumination in a structured fashion, then processing the captured images,

The 4 day contest is seen by thousands and then put up for illumination for two weeks.

The fluoresced light, which is usually at a longer wavelength than the illumination, is then imaged through a microscope objective.

The strong hand can then be used to draw a sidearm, and place the hands back to back to provide support and illumination in the firing position.

The hyper-radial lens was made in 1885, by the F. Barbier Company in Paris as a test lens for the lighthouse illumination trials then going on at the South Foreland Lighthouse in the UK.

If the task is challenging, such as playing cricket, then reaction times are found to increase significantly when the illumination declines to the gloom level.

In fluorescence microscopy, dichroic filters are used as beam splitters to direct illumination of an excitation frequency toward the sample and then as an analyzer to reject that same excitation frequency but pass a particular emission frequency.

There is a large literature on how one might estimate the ambient illumination from the camera data and then use this information to transform the image data.

This is in contrast to other popular methods of lighting such as vertex lighting, which calculates illumination at each vertex of a 3D model and then interpolates the resulting values over the model's faces to calculate the final per-pixel color values.

It lies in that portion of the lunar surface that is sometimes brought into view of the Earth under conditions of favorable libration and illumination, but even then the crater is seen from the edge and not much detail can be observed.

The aspirations of church building reached its zenith then, and the groin vault was pursued aggressively for its ability to create strength, without massive buttress formations ; in addition, it provided the church architects a remedy for the dim illumination inherent in the barrel vault design, since the barrel vault had to minimise fenestration to retain adequate strength.