Why are there no ceiling lights in many hotel rooms? Does darkness affect comfort?

As the light technology matures, ordinary fluorescent tubes are gradually replaced by LED lights. Take the long-term use of Taiwan's Xinyuan LEDs in the hotel industry as an example. The daily T50 fluorescent tubes are five times the cost of linear light beams with the same illumination intensity. 10 times the daily energy consumption and one tenth of the service life. With the technological innovation, the lighting design of hotel rooms and public areas has gradually changed from point light source to scattering light source in the past ten years, achieving a win-win situation of energy saving and aesthetics. Although the answer is intentional, I know it but I don’t know why. This problem should be part of the lighting design of the room design. I have also been interested in lighting design for some time, but I have not systematically studied design and can only talk about the general idea.

First of all, is there really no ceiling lamp in many rooms now? (Look first, don't ask why)
I don't know how many hotels I have lived in or how many hotels I have seen. Let's start with Google Image Gallery.
Enlarged picture can be seen, in the 15 pictures in the front row, there are 2 sets of ceiling lights, and the rest basically use the light trough and spotlights.
The reality seems to be exactly as the title of the subject, and the headlights mentioned by the title should be the two types (ceiling lights and chandeliers) that are all in the picture? The following "top lights" mainly refer to these two types, and you will automatically make up the brain.

Secondly, let's first take a look at the knowledge of lighting design:
What are the general principles of lighting design:
Functional principle: lighting design must meet the functional requirements, choose different lighting methods and lamps according to different spaces, different occasions, different objects, and ensure proper illumination and brightness.
The principle of aesthetics: lighting is an important means of decorating the environment and creating an artistic atmosphere. In order to decorate the interior space, increase the spatial level, render the ambient atmosphere, and use decorative lighting, it is very important to use decorative lighting. The luminaire not only plays a role in ensuring the illumination, but also pays attention to its shape, material, color, proportion and scale. The luminaire has become an indispensable decoration for the interior space.
Economic principle: Lighting is not necessarily good, and the key is to be scientific and reasonable. Lighting design is to meet the needs of people's visual physiology and aesthetic psychology, so that the indoor space maximizes the practical value and appreciation value, and achieves the unity of the use function and aesthetic function. Glittering lighting can not only add to the icing on the cake, but also add to the snakes, causing power consumption, energy waste and economic losses, and even causing pollution of the light environment and detrimental to the health of the body.
Safety principle: Lighting design requires absolute safety and reliability. Since the lighting comes from the Power Supply, it is necessary to take strict safety measures such as protection against electric shock and breakage to avoid accidents.
Several main forms of lighting design:
Surface light performance: Surface light performance surface light refers to the luminous surface made of indoor ceiling, wall and ground. The skylight is characterized by uniform light, sufficient light, and various forms of expression. If the ceiling is used, the light density should be the same to ensure sufficient light in each space. If a large-area downlight is used, the regular bull's-eye light on the ceiling is like a night sky. If it is combined with the ceiling beam structure, Designed as a light well, the fiber is ejected from the well to create a unique spatial effect (the simplest example: the ground design of the illuminated dance floor).
Light performance: The so-called light is a light strip that arranges the light source into a strip shape. The expressions vary widely, with squares, grids, bars, bars, circles, triangles, and other polygons. Such as peripheral flat type light belt ceiling, peripheral concave type light belt ceiling, inner frame type light belt ceiling, inner frame concave type light belt ceiling, peripheral light belt floor, inner frame light belt floor, ring type light belt floor, upper Projection slot, ceiling recessed light slot, ground recessed light slot, etc. Long strips of light have a certain degree of guiding, and are often used as guiding lighting in the design of public places where there are many people. Other geometric strips are generally used for decoration.
Spot light performance: Point light refers to a small and concentrated light source. Due to its high light illumination, it is mostly used for direct lighting or accent lighting in restaurants, bedrooms, study rooms, as well as in shop windows, stage and other places. There are various ways of expressing light, such as top light, bottom light, smooth light, back light, side light, etc.:
a. Top light: refers to the top-down lighting, similar to the summer direct noon direct sunlight. The projection of the illuminated object is small, and the contrast between light and dark is strong. It is not appropriate to not make the modeling light.
b. Bottom light: Bottom-up lighting should be used as an auxiliary light distribution.
c. Shunguang: From the front of the illumination, the projection is dull, the color of the illuminated object appears completely, but the stereoscopic feeling is poor.
d. Backlighting: The lighting from the front, the outline of the illuminated object is distinct, and the silhouette effect with artistic charm is the commonly used light distribution method in photography art and stage canopy.
e. Sidelight: refers to the illumination from the left and right and upper left, upper right, lower left, and lower right directions. The projection of the illuminated object is clear, the stereoscopic effect is strong, and the level is rich, which is the most acceptable illumination mode for people.
Static lighting and flowing lighting:
A. Static lighting: The fixture is fixed, the illumination is still, and the flashing light is still. Most indoor lighting uses static lighting, which can make full use of light energy and create a stable, soft and harmonious light environment.
B. Flowing Light: It is a flowing lighting method. It has rich artistic expression and is a commonly used means in stage lighting and urban neon advertising design.
Laser: A beam of light emitted by a laser. The medium that generates the laser beam is crystal, glass, gas (such as argon, helium, neon, etc.) and a dye solution. (This is almost impossible to use in the lighting design of the room)
Several common factors to consider in lighting design:
Luminous intensity and brightness
Luminous flux (Lcd) and lumens
Illuminance (lux)
Light angle (planar angle and solid angle)
Color temperature (k) [2]
Color rendering
light source
Finally, let's take a look at what the lighting design of a hotel room generally follows:
Four principles:
Functionality: Does the room's ceiling light have to be present? If so, what is its main function? And besides the ceiling light? Are there other types of supplemental light sources to replace the dome light? Common ceiling lights are ceiling lamps, various chandeliers, etc., which are generally located in the center of the ceiling, as the central light source of the room, and the functional light source in the room is generally divided into several parts: bedside reading light, dressing table lighting Lights, desk writing lights, room-based lights, and the settings of these lights have basically met the functional requirements of the room, that is, the ceiling light does not have to exist.
Aesthetics: The general ceiling lamps are simple in shape, and the high-end hotels are basically not used. At this time, there are various chandelier designs. Common crystal lamps, European chandeliers (like candlesticks), Chinese chandeliers (imitation lanterns) Shape), and the use of these lights must be high enough for the house, otherwise it seems more cramped.
Economical: The ceiling light is generally considered to be a relatively large thing in the room lighting. This product will not be very cheap (but if it is a cheaper hotel, it is another matter to get a basic ceiling lamp). Most hotels (mainly referred to as high-end hotels) do not use central ceiling lights. On the one hand, they need to be considered for cost control. On the other hand, due to the frequency of use, the average high-end hotel is impossible to give you only one. Ceiling lights, as well as a variety of decorative light sources, and a variety of decorative light sources can actually meet the lighting needs, the ceiling lights sometimes become a gorgeous "display."
Safety: The ceiling light itself is not unsafe (usually it will not suddenly fall down), and the ceiling light is easy to accumulate due to its styling characteristics. The hotel staff will be relatively troublesome when cleaning up, and it is also a little dangerous (because of comparison) high).
Manifestations:
Ceiling lights and chandeliers are static lights, and their illumination range depends on their track design. Different ceiling lights have different indicators in terms of luminous intensity, brightness and color temperature. If you don't pay attention, it becomes a phenomenon that the ceiling light is on the roof. Is it bright? Really bright. But it does not look good.
Top-down lighting methods, in addition to ceiling lights, chandeliers and other central light sources, are now used in a variety of light troughs and in-line strips, and some with small spotlights. On the one hand, this kind of light source is sufficiently dispersed, the illumination range is large enough, and on the other hand, it is softer, eliminating the trouble of glare. But is this way perfect? That is not the case, the light pass of the light trough is wasted, which means that it will be wasted.
At the same time as the ceiling light, there are still many auxiliary light sources (functional supplements and aesthetic decoration), and without the ceiling light, other lights can already meet the basic lighting needs. Simply put, the ceiling light is dispensable.
Indicators:
There are various indicators such as light intensity, light, luminous flux, illumination, color temperature, etc., and the lighting design of the room needs a whole consideration. It is not enough to consider the "light" mentioned by the main lock. The comfort of the room is really related to the design of the lighting. Generally, the multi-light combination mode with the same color temperature is used, and the general illumination of the room is generally low (between 50 and 100 lux), which creates comfort. The rest environment, the brightness of this illuminance is obviously more suitable for the strip-shaped scattered light source, only one ceiling lamp can not meet the demand, but will be darker.
Should there be a ceiling light setting in that room?
Not necessarily, as mentioned above, lighting design is a whole and an important part of interior design. It needs to cooperate with various factors, so don't be partial. Rather than having a ceiling light in the hotel, it is better to say that the overall lighting in the hotel is dark. Europeans have a shallower overall pupil color and are more sensitive to light than Asians, so if the room is too bright, they will feel uncomfortable and unable to relax. Therefore, hotels in traditional Europe are dominated by multiple indirect lighting and low angle lighting. In this way, everyone thinks that the high-angle, high-brightness lighting in the bedroom will make people feel less trouble and cheaper. The hotel culture is spread out in Europe. Many hotels around the world use darker lighting in order to highlight their high level and comfort. But for the dark pupils of the Orientals, the room was a bit darker.

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