LED color temperature of basic common sense
LED products, a number of important specifications is the color temperature, which relates to LED lighting products feature the colors shown, the general also has a color temperature of lighting specifications. High and low color temperature measurement unit is KelvinScale, also based on K as a unit, beginning with a Kjeldahl observed in the steel plant began to dissolve the metal to the highest temperature, the shiny metal of different colors presented, and the data units recorded, Later, the color temperature to produce the specifications table.
First, the definition of color temperature:
Expressed in absolute temperature K, that is the standard black body heated, the temperature rises to a certain extent the beginning of the black body color dark red - light red - orange - white - blue, gradually changing the color of a light source with the same black body, we When the absolute temperature of the blackbody as the light source color temperature.
Second, the color temperature of different light environments:
The following is a general common lighting used for color temperature
Halogen 3000k
Tungsten 2700k
HPS 1950-2250k
Candle light 2000k
Metal halide lamps 4000-4600k
Cool Camp Light 4000-5000k
High-pressure mercury lamp 3450-3750k
Warm Fluorescent 2500-3000k
Clear sky 8000-8500k
6500-7500k
cloudy Midday summer sun 5500k
Afternoon daylight 4000k
Third, the different color temperatures of light color:
1, low color temperature: 3300K color temperature in the following, the light red color cast give a warm feeling; a stable atmosphere, warm feel; when irradiated with low color temperature light source, make red more vivid.
2, the color temperature: color temperature 3000 - 6000K for the middle, in this tone was particularly evident under non-visual psychological effect, a refreshing feeling; so called "neutral" color temperature. When using the color temperature light irradiation, the blue with a cool feeling.
3, High Color Temperature: Color temperature more than 6000K, the color of light blue, gives a cool feeling, when the high color temperature light source according to time, so that the object has the feeling of cold.
ROHs standard instructions
RoHS directive covers a wide range of products, covering almost all electronic, electrical, medical, telecommunications, toys, security information and other products, which includes not only the whole product, but also used in production of machine parts, raw materials and packaging components , of the entire production chain.
ROHs directive defines: RoHS is European Union legislation to establish a mandatory standard, which stands for "Restriction of the use of certain electrical and electronic equipment, hazardous substances" (Restriction of Hazardous Substances). The standard will be July 1, 2006 began the formal implementation, mainly for electrical and electronic products, materials, specifications and process standards, making it more conducive to human health and the environment. The standard aims to eliminate electrical and electronic products, lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls and polybrominated diphenyl ether will be a total of six hazardous substances that pollute the environment.
ROHs the standard instructions:
| RoHS banned substances Name |
RoHS standard thick crossing (ppm) |
| cadmium (Cd) |
100ppm |
| Lead (Pb) |
1000ppm |
| mercury (Hg) |
1000ppm |
| hexavalent chromium (Cr6 +) |
1000ppm |
| polybrominated biphenyls (PBB) |
1000ppm |
| polybrominated diphenyl ethers (PBDE) |
1000ppm |
Ppm: parts per million, said that a few parts per million. |
