1. Luminous intensity (brightness) What is the meaning? A: The luminous intensity (brightness, I) is defined as: at a party in the light of luminous intensity up, that is, luminous body in unit time injection by the amount of light, also referred to as Light, the unit used for the candlelight (cd, Candela), an international definition for a candlelight vigil to whale oil candle made of 120 per hour burning cold frame (grain) issued by the light, a cold frame equal to 0.0648 g

2. Luminous intensity (brightness) is a unit of what?: Luminous intensity units used for the candlelight (cd, Candela), the international standard candles (lcd) is defined as the ideal black body temperature in the freezing point of platinum (1769 ℃), vertical In bold (as its surface area 1m2) on the direction of the 60 ten-thousandth of the light, the ideal of the so-called blackbody radiation is the object of a rate equal to, the objects absorb the energy of all radiation can go out, so that the temperature has been fixed uniform, international standards Candlelight (candela) and the old standard candle light (candle) for the exchange of relations between the 1candela = 0.981candle

3. Flux what? What is the unit of luminous flux? A: The luminous flux (φ) is defined as: point source or non-point source at the time units issued by the energy, which may have a visual person (who can feel out of the radiation - Volume) that is known as flux. The unit of luminous flux lumens (abbreviated lm), 1 lumens (lumen or lm) is defined as an international standard candles in the light of the unit with three-dimensional arc angle adopted by the luminous flux, as the whole area of spherical 4πR2, so Ming-class equivalent to a flux Candlelight issued by the flux of 1/4π, or a spherical 4π, therefore, in accordance with know ANSI definition of a cd-point source radiation 4π will lumens, that is, φ (lumens) = 4πI (candlelight), it is assumed that for a very small △ Ω Three-dimensional angle of the arc, △ Ω solid angle in flux △ φ, there are △ φ = △ ΩI

4. A foot candlelight What is the meaning?: A foot candle light is the distance light of a candle light (or non-point sources source points) and a foot long and orthogonal light on the surface of the light, abbreviated as 1ftc (1 lm/ft2, lm / 2 feet) per square foot in the reception of the flux of 1 lumen at the time of illumination and 1ftc = 10.76 lux

5.'s One-meter candlelight What is the meaning? A: The one-meter distance is the candlelight of a candle light source (point source or non-point source) and one meter long and orthogonal light of the light plane, known as Lux (Lux, also written in lx), that is, per square meter in the reception of the flux of 1 lumen at the time of illumination (lm / m 2)

6. 1 lux What is the meaning?

A: The per square meter in the reception of the flux of 1 lumens of illumination when

7. What is the meaning of illumination?: Illumination (E) is defined as: being exposed as objects unit area on the acceptance of flux, or by exposure to light objects in unit time per unit area on the acceptance of light, Units in meters or feet candlelight candlelight (ftc) said

8. Illumination and brightness, the distance between what is the relationship? A: The intensity and luminosity, is the relationship between the distance: E (illumination) = I (light) / r2 (the square of the distance)

9. Illumination of the body as being the size of the factors related to? Answer: According to the body and the illumination of the LED light source and the intensity and as the distance between the light source, but as with the body color, surface and the nature of the surface area the size of Has nothing to do
10, luminous efficiency (lm / W, lm / w) meaning?
A: The light emitted by the total flux of the light source and the consumption of electric power (W) ratio, known as the light source of optical effect
11, What is the temperature?
A: When the light emitted by the color and black body radiation at a temperature of the same color on the black body temperature for the color temperature