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Bicycle Lights Flashlights Head Lamps Diving Lights LED Night Lights LED Sensor Lights LED Bulb
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What’s LED? |
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A Light Emitting Diode (LED) is a solid-state semiconductor device that converts electrical energy directly into light. On its most basic level, the semiconductor is comprised of two regions. The p-region contains positive electrical charges while the n-region contains negative electrical charges. When voltage is applied and current begins to flow, the electrons move across the n region into the p region. The process of an electron moving through the p-n junction releases energy. The dispersion of this energy produces photons with visible wavelengths. |
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Definition of Light sources |
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Name |
SI Units |
Description |
Luminous
Intensity |
Candela
cd |
The luminous flux density per solid angle as measured in a given direction relative to the emitting source. |
Luminous
Flux |
Lumen(lm) |
The rate of flow of light per unit of time, especially the flux of visible light expressed in lumens, frequently defined as one lumen per square meter (lm/m2). |
Illuminance |
Lux(lx)
lm/m2 |
The density of luminous power, also called “illumination.” One lumen of luminous flux, uniformly incident on 1 square foot of area, produces an illuminance of 1 footcandle; in SI units, one lumen of luminous flux, uniformly incident on 1 square meter of area, produces an illuminance of 1 lux. |
Luminance |
Nit
(cd/m²) |
luminous flux incident on a unit area, The intensity of light per unit area of its source. 1 nit = 1 cd/m2 |
Luminance Efficiency |
Watt(w)
lm/W |
The light output of a light source divided by the total electrical power input to that source, expressed in lumens per watt. A light source with a higher lumen per watt value is more efficient. |
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Color Temperature |
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The measurement of color expressed in Kelvin (K). The reason this measurement is called a "temperature" is because it was derived from a theoretical object called a "black body radiator." When the radiator is heated, it changes from black to red to yellow to white to blue. The lower the Kelvin rating, the "warmer" or more yellow the light. The higher the rating, the "cooler" or more blue the light. See white balance. |
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Lighting |
Approximate |
Temperature |
In Kelvin |
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Candle
Indoor tungsten
Indoor fluorescent
Outdoor sunlight
Outdoor shade
North sky
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1,800 K
3,000 K
4,000 K
5,500 K
7,500 K
28,000 K |
Higher color temperatures (5,000 K or more) are cool (blueish white) colors, and lower color temperatures (2,700–3,000 K) warm (yellowish white through red) colors.
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JIS IPX Waterproof Grade |
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JIS IPX 8 |
Submersible |
The equipment is usable for continuous submersion in water under specified pressure |
JIS IPX 7 |
Immersion resistant |
Water shall not enter the enclosure when it is immersed in water under defined conditions |
JIS IPX 6 |
Water tight |
Direct jetting water from any direction shall not enter the enclosure |
JIS IPX 5 |
Jet resistant |
Direct jetting water from any direction shall have no harmful effect |
JIS IPX 4 |
Splash resistant |
Splashing water from any direction shall have no harmful effect |
JIS IPX 3 |
Rain resistant |
Falling rain at an angle up to 60 degrees from vertical shall have no harmful effect |
JIS IPX 2 |
Drip resistant 2 |
Dripping water at an angle up to 15 degrees from vertical shall have no harmful effect |
JIS IPX 1 |
Drip resistant 1 |
Vertically dripping water shall have no harmful effect |
JIS IPX 0 |
- |
No Special Protection |
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UK Wide-angle Series
web5000.