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The classification of fixed lamps. Fixed luminaires are luminaires that cannot be easily moved from place to place. Such luminaires can only be moved by means of tools or used in places that are not easily accessible. Fixed lamps include ceiling lamps, chandeliers, wall lamps, etc. Things to watch out for when purchasing crystal lighting. Ceiling light is mounted directly on the ceiling. Including the downward projection lamp, astigmatism and full lighting and other types of lights, incandescent lamp light source ceiling and fluorescent ceiling lamp, the feature is to make the top of the room bright, constitute a bright sense of the entire room. The disadvantage is that it is prone to glare. Since it is relatively low in the general residential floor, it is widely used. However, the shape, arrangement, structure, and use of materials for ceiling lamps must be considered in accordance with the requirements of use, ceiling construction, and aesthetic requirements. The size of the lamps and lanterns should be compatible with the indoor space, and the structure must be safe and reliable. Crystal lamp, modern crystal lamp purchase method. Chandeliers are generally lamps that are suspended from the ceiling. They are the most commonly used general lightings, and they have direct, indirect, down-illumination, and uniform light dispersion. The size of the chandelier and the number of lamps are all related to the size of the room. The chandelier is generally 500 to 1000 mm from the ceiling, and the center of the light source is 750 mm from the ceiling. It can also be high or low depending on the specific needs. Lighting mask purchase method. Wall light is a light fixture installed on the wall. It is a lighting fixture for people with light interior decoration and complementary lighting. Due to the low height from the ground, low power bulbs are generally used. The height of the luminaire itself is 450-800 mm for large ones and 275-450 mm for small ones. The diameter of the lampshade is large, Ф150~250mm, and small Ф110~130mm. The distance between the lamp and the wall surface is generally 95~400mm. The light source power is commonly used for wall lights, large-scale use of incandescent bulbs of 100 watts and 150 watts, and small-scale use of incandescent bulbs of 40 watts and 60 watts. Compact fluorescent lamps can also be used instead of incandescent bulbs.