Types of desk lamps
Code lamps code lamps code lamp types
B wall lamp L floor lamp T table lamp
C Bedside Lamp M Door Lamp X Ceiling Lamp
D Pendant Lamp Q Recessed Ceiling Lamp W Not Listed
Type and Code of Light Source
Code Type Code of Light Source Type of Light Source Code Type of Light Source
Unmarked Incandescent Lamp G Mercury Lamp J Metal Halide Lamp
Y Fluorescent Lamp X Xenon Lamp H Mixed Light Source
L Tungsten Halogen Lamp N sodium lamp
Common lighting terms
Luminous fluxΦ lumen Lm The sum of the amount of light emitted by the illuminant per second, that is, the luminous flux
Light intensity I candela cd luminous flux emitted by the illuminant within a unit solid angle in a specific direction
illuminance E lux Lm/m2 luminous flux illuminating the illuminated object per unit area
Brightness L Niter cd/m2 The luminous flux of the luminous body in a specific direction per unit solid angle and unit area
Luminous efficiency per watt lumens Lm/w The ability of an electric light source to convert electrical energy into light to the luminous flux emitted Divide by power consumption to express average lifespan
hours refer to the number of hours when a batch of bulbs is damaged to 50% of the number
Economic lifespan hours also consider bulb damage and the beam output is attenuated, the combined beam output is reduced to a specified number of hours. This ratio is 70% for outdoor light sources and 80% for indoor light sources such as fluorescent lamps.
Color temperature K absolute temperature Kelvim When the color of the light emitted by the light source is the same as the color radiated by the black body at a certain temperature, the temperature of the black body is called the color temperature of the light source. The theory of black body radiation is based on thermal radiation, so the spectral power distribution of thermal radiation light sources such as incandescent lamps is relatively close to the spectral power distribution of black bodies in the visible region, both of which are continuous spectrum. The concept of color temperature can fully describe this. The color property of the class.
Correlated color temperature K When the color of the light emitted by the light source is close to the color radiated by the black body at a certain temperature, the temperature of the black body is called the correlated color temperature of the light source. Since the gas discharge light source generally has a discontinuous spectrum, which cannot be completely matched with the continuous spectrum of black body radiation, the correlated color temperature is used to approximately describe its color characteristics. A light source with a color temperature (or correlated color temperature) below 3300K has a reddish color, giving people a warm feeling. When the color temperature exceeds 5300K, the color is bluish, giving a cool feeling. Generally, in areas with high temperature, people mostly use light sources with a color temperature higher than 4000K, while in areas with lower temperatures, light sources below 4000K are often used.
The color rendering index Ra refers to the rendering degree of the light source to the real color of the object as the color rendering of the light source. The color rendering of the light source is indicated by the color rendering index, which indicates that the color deviation of the object under light compared with the reference light (sunlight) can reflect the color characteristics of the light source more comprehensively. The color rendering index is based on the standard light source, and its color rendering index is set as 100. The color rendering index is expressed by Ra. The larger the Ra value, the better the color rendering of the light source. There are two types of color rendering: faithful color rendering: a light source with a high color rendering index (Ra) can be used to correctly express the original color of the material. The value is close to 100, and the color rendering is the best. Effect color rendering: To clearly emphasize specific colors and express the beauty of life, you can use the additive color method to enhance the color rendering effect.
Characteristic comparison of common light sources
Light source type efficiency (Lm/W) Color rendering color temperature. K light color effect application
Ra evaluation
Incandescent clear light bulb 6~25 100 Excellent 2900 With warm effect, high brightness slightly requires the living room, bathroom, etc. place.
Frosted Foam 6~25 Table lighting with warm and comfortable effect to show the beauty of food.
Pearl bubble 10~15 The light color is soft and the lighting atmosphere is happy.
Halogen lamp J, JCV, JC, JDR type 10~20 100 Excellent 3000 Good color rendering, clear light color, bright lighting for dining table, living room, wall decoration, commodity display and so on.
Fluorescent lamp daylight color 45~75 74 to 6500 bluish light, with a cool atmosphere in general places
white 48~82 61 to 4200 slightly yellow light, with a warm atmosphere
Daytime white 48~82 72 5000 White light, with a soft atmosphere
High color rendering 58~95 95 Excellent 5000 Same as incandescent bulbs where true color performance is required
Three wavelength daylight color 54~88 84 Best 6700 Cool feeling, primary color of objects, clearly visible in study, living room, bedroom, etc.
Three wavelength white 58~95 84 Best 5000 Soft color, natural and healthy
Mercury lamp clear light 40~50 23 Poor 6000 Dazzling garden, landscape lighting, outdoor channel lighting, wall lighting, corner lighting
Fluorescent color 45~70 53 Fair 4100 White light, less dazzling
