One. According to shock protection method, lightings can be divided into:
1. 0 type lighting: lightings, which only rely on basic insulation protection, in case basic insulation disabled, we just rely environment, can provide reliable protection.

2. I type lighting: depends on not only basic insulation, but also additional safe protection measure (for example, grounding), touchable electric parts are all connected with grounding wire. So, when the basic insulation disable, touchable parts will not become electrified body .

3. Ⅱ type lighting: not only ahs basic insulation to prevent from shock, but also has safe prevention measure such as double insulation or reinforced insulation to supply reliable protection.

4. Ш type lighting: depend on SELV to prevent the danger of electric shock, and lighting fitting will not produce voltage higher than safe low voltage (under 50V).

　　 At present, I type and II type lights take up most part of the market, ordinary, we are not suggest people to use 0 type lighting, III lighting is hard to see in domestic market, because the technology is hard to be mastered.

Two: According to way of installation, lightings can be classified into:
1. Fixed lighting
　　 Lights cannot be moved from one place to another place. The kind of light just can be moved with the help of tools or applied in certain place that cannot easily touch. Fixed lighting including: ceiling lamp, pendant lamp, wall lamp etc. Commonly, pendant lamp is light hanging in the ceiling, which is the most common illumination way. There are many light models, for example straight shine, indirect shine, downward shine and equal flooding. The size of the droplight and the number of bulb is depending on the size of the room. Generally, pendant lamp is 500-1000mm always from ceiling, the center of pendant lamp should be 750mm always from the ceiling. You can adjust the height of accordingly. Ceiling lamp is the light, which directly install on the surface of the ceiling. It has downward shining, flooding, and overall illuminating etc. Light source including incandescent lamp and fluorescent lamp, the advantage is that it can lighten the top of the room, and make people feel the whole room is lightening, the disadvantage is that it will produce glare. Because the height of ordinary house is low, so it can be applied widely. But the shape, structure and materials needs consider according to the requirement, shape of the hook and aesthetic needs. The size of the lamp must fit for the room, and the structure must safe and reliable. Wall lamp is install on the wall. It is for indoor decoration and complementary lighting fitting, because it is not too much distance from the floor, so normally we use low power bulb. The height of the lighting fitting is about 450-800mm for big size, 275-450mm for small size. The size of lampshade is 150-250mm diameter for big size and 110~130mm diameter for small size. Distance from lighting fitting to wall is about 95mm to 400mm. For lamp source that wall lamp use, for large lamp we suggest you use 100W or 150W incandescent lamp, for small size, use 40W or 60W incandescent bulb. You may also use compact fluorescent lamp to replace incandescent lamp.

2. Mobile lighting fitting
　　 Normally, this light can move from one place to another after connected to the power. Generally, table lamp, floor lamp is of this kind, which is a kind of most flexible lighting fitting. The height of large floor lamp is 1520mm to 1850mm, diameter of lampshade is 400mm to 500mm, use 100W incandescent lamp, height of small size floor lamp is 1080mm to 1400mm, or 1380mm to 1520mm, diameter of the lampshade is 250mm to 450mm, use 60W, 75W or 100W incandescent lamp; height of medium size floor lamp is 1400mm to 1700mm. General height of large table lamp is 500mm to 700mm, diameter of lampshade is 350mm to 450mm, and should use 60W, 75W, or 100W bulb; general height of table lamp is 250mm to 400mm, diameter of lampshade is 200mm to 350mm, and should use 25W or 40W lamp; overall height of medium size table lamp is 400mm to 550mm.

3. Embed lighting fitting
　　 Lighting fittings that manufacturer appointed to embed entirely or partly into the install surface. Generally speaking, it refers to lighting fitting hidden inside the ceiling. Lightings connecting with ceiling, generally it belongs to downward shining, which is not regular use in ordinary family but in room with air conditioner and integrated ceiling. But embed lamp looks a little bit dark, so it often use together with other lighting fittings.

Three. According to the category of light source, lighting fitting can be divided into:
1. Incandescent lamp lighting fitting
　　 The work theory of Incandescent lamp is lightening through heat up filament into incandescent situation, the light efficiency raise along with the temperature of filament, but the side effect is: heats will run away quickly and the service life span is short. This kind of light source has low luminous efficiency; the rated average life span is 1000 hours
.

2.Fluorescent lamp light fitting
　　 Fluorescent lamp is a kind of low-pressure mercurial vapor discharging light source, the tube structure is consist of lamp base, hot cathode and glass tube with fluorescent dye on the inner wall. The fluorescent dye will emit visible light when under ultraviolet. Hot cathode is tungsten filament with heat emission electrons. Vacuumed tube then injects low-pressure mercurial vapor and argon. Because different fluorescent dye, the tube will display in sunlight color, cool white, white and warm red separately. The luminous efficiency of fluorescent lamp is high and the life span is around 2000h to 3000h.

3. Halogen tungsten lamp fitting
　　 Halogen tungsten lamp is also thermal radiation light source, it is to a small amount halide (for example: iodide or bromide, which is called iodine tungsten lamp and bromine tungsten lamp respectively) in incandescent lamp bulb or tube, which made of hard glass or quartz glass, through the theory of halogen tungsten to use halogen as medium, to draw back tungsten that evaporate and attached on the inner wall of the glass, thus improve the luminous efficiency and service span of halogen tungsten lamp; and the size is smaller then incandescent lamp, so it is extensively applied in automobile headlight, TV, shooting, shop window, stage and ballroom and other occasions. According to its shape, it can divided into halogen tungsten tube lamp, single end halogen tungsten lamp, Hotspot halogen tungsten lamp and enclosed shooting halogen tungsten lamp etc. many varieties.

　　 Other high-pressure gas discharge lighting fitting, LED. They have different colors, brightness, so they are suitable for different place. For example, energy saving lamp is high efficiency, it is more suitable to use in kitchen and toilet, incandescent light is gentle, and more suitable to use in bedroom.

Four. According to the environment, light fitting can be divided into: light fitting for ordinary condition, and light fitting for bad condition.

Five. According to the functions, light fitting can be divided into: illuminate fitting, signal light fitting, effect light fitting etc.

Six. According to design install material, light fitting can be divided into: F signal light fitting, F overcast sign light fitting, caution sign light fitting.

Seven. According to connection way of external soft cable, soft wire, light fitting can be classified into: X connection, Y connection, Z connection.

　　 And other classifies measures besides the situation mentioned above.

4　Light fitting and illumination
　　 Let’s talk about choose of light fitting from the original function of light fitting, illumination. Remove the decoration function; the most important purpose for purchasing lamp is still for indoor illumination. Many people may think light fitting is use to illuminate, so it must be the brighter the better. But that perception is not true, the lightness percentage have certain connection with indoor space, too dark or too bright will do harm to eyes, and it is not wise from the angle of energy saving. If we just consider illuminate effect and remove creating atmosphere, house space area (sq. meter), luminous power: