What is the luminous effect of solar street lights?

Luminous efficiency (lm/w): The luminous flux emitted by the light source divided by the power consumed by the light source. It is an important indicator to measure the energy saving of light sources.

Now solar street lights are generally used LED light sources. LED, also known as diode, is a solid semiconductor device that can convert electrical energy into visible light. So what are the advantages of LED lamps? It is mainly manifested in the following four aspects

1. High efficiency and energy saving
Low-voltage drive, ultra-low power consumption (single tube 0.05W). Luminous power conversion is close to 98%,LED lamps are more than 60%-80% energy-saving than traditional energy-saving lighting, and installation is flexible, convenient, durable and reliable.

2, green environmental protection
Light no ultraviolet no infrared, no radiation, light effect is soft, no stroboscopic, frequency open, belongs to the real green lighting source,LED lighting does not heat. It does not contain harmful elements such as mercury and xenon, which is conducive to recycling and secondary use.

3. Super long life
Strong shock resistance, strong dust resistance, low energy consumption, small voltage and current required, low heat, less luminous heat, no safety risks, high safety factor,LED lighting belongs to the solid light source, epoxy resin package, the luminous part is not easy to loosen. There is no filament easy to burn, thermal deposition, high light decay and other shortcomings, the service life of up to 30,000 to 50,000 hours, 30 times that of ordinary bulbs, equivalent to uninterrupted lighting for three years.

4. Scope of application
Home lighting, sky lights, office lighting, residential lighting, shopping malls, supermarkets, stalls and shops, restaurants and hotels, bars, cafes, Western restaurants, entertainment venues, family night lights, festive atmosphere with lights. Solar lighting applications, urban lighting and beautification projects are widely used.

Luminous flux (lm): The total amount of visible light emitted by a light source per second. For example, a 100 watt (w) bulb can produce 1500lm, and a 40 watt (w) fluorescent lamp can produce 3500lm of luminous flux. ◇ Luminous intensity (cd): the luminous flux emitted by the light source in the unit solid Angle, that is, the density of the luminous flux emitted by the light source in the space selected direction. The unit of light intensity is Cantera (cd), also known as candlelight. For example, light emitting 1 lumen within 1 unit of stereo Angle is called 1 Cantera (1cd). Luminance: LED is a light-emitting device, brightness refers to the unit area of illumination, the unit is: candle/square meter, LED standard drive current is 20mA.

Color temperature (k): expressed in absolute temperature (k=℃+273.15)K, that is, when a black body is heated, the temperature rises to a certain degree, the color gradually changes from dark red - light red - orange red - yellow - yellow white - white - blue white - blue. When a light source is the same color as the blackbody, we call the absolute temperature of the blackbody at that time the color temperature of the light source. For example, when the blackbody is heated to show a deep red, the temperature is about 550℃, that is, the color temperature is 823K.

Color rendering (ra): The degree to which the light source renders the color of the object itself is called color rendering. That is, how realistic the color is. The CIE International Commission on Illumination puts the color rendering index of the sun at 100. The color rendering index of various light sources is different. For example: incandescent lamp ra≥90, fluorescent lamp ra=60∽90.

Viewing Angle: The Angle is divided into X axis (left and right)Y axis (up and down) when the central axis is 1, the Angle between the left and right or the upper and lower axis is 1/2 of the viewing Angle; E.g. 70 ° Viewing Angle means 35 ° up and down or left and right from the center point.

Wavelength: The wavelength of light emitted by the diode luminescent tube, the general red wavelength is 620-660nm, pure green 520-530nm, blue 470-480nm, yellow 580-890nm, yellow green 550-570nm, please refer to the chroma diagram, different wavelengths of light emitted color is different; The mixed light of the two colors is also different.

Quaternary system: refers to the light emitting diode made of four chemical elements of ALInGaP, which can emit light between yellow and green/yellow/orange/red (wavelength 550-630nm), with high brightness and low attenuation characteristics, which is the mainstream product of outdoor light emitting diodes.

Pure green/yellow-green: Traditional green LED is mainly yellow green, wavelength from 550-570nm, low price, low brightness, fast attenuation, 1994 Japan sub-manufacturing company produced a pure green (wavelength 520-530nm) high price, high brightness, slow attenuation, widely used in outdoor display, The two products are very different and must be distinguished clearly in design.

Monochrome/double primary/full color screen: the three primary colors are red/green/blue; If a pixel tube contains these three light-emitting diodes, it is called a full-color display; If only red + green is called the double primary color screen, if only one color such as red or yellow is called the monochrome display, the monochrome display is mainly to play pure text content, the double primary color is mainly to text + pattern + animation, the full color screen is mainly to broadcast video signals.

Service life: refers to the time when the brightness of the LED reaches half of the initial value, which becomes the half-life, and different chips are used in different environments will have different service life.

Brightness attenuation curve: the curve of brightness and time of various chips under certain conditions (temperature, current); This curve can really understand the characteristics of the chip.

Chip/single lamp/pixel tube: the diode light emitting tube is a semiconductor material, the light emitting element is called chip, and the chip is packaged into the smallest unit that can be lit, called single lamp; Many small lamps are assembled into a large tube filled with glue and covered to become a pixel tube.

Point diameter: refers to the diameter of the pixel tube.

Point spacing: refers to the distance between two adjacent pixel tube centers, the standard distinguishable lamp point spacing = lamp point diameter × 1.25.

Visible distance: refers to the distance at which the display body can be clearly seen, this distance is related to the height of the displayed text, simple quick calculation formula :-- the nearest visible distance :50× word height (m)-- the farthest visible distance :200 word height (m)

Brightness automatic adjustment: LED with the intensity of the ambient brightness, and the intensity of their own brightness is also adjusted, generally to reduce the current method to achieve the purpose of reducing brightness.

Point density: how many pixel tubes there are per square meter.
Operating temperature: The lowest and highest temperature at which the display can be used normally.