WHAT DOES THE ABBREVIATION MEAN WHICH IS USED ON UPRTEK SPECTROMETER?
Product Function
UPRtek Light Measurement Meters used abbreviations, full names, units and descriptions are as follows:
| Abbreviation | Full Name | Unit | Descriptions |
|---|---|---|---|
| CCT | Color Correction Temperature | K | The color temperature is the color radiated by a black-body radiator under different temperatures. CCI has the color that is the closest to the ideal black-body radiator. |
| CRI (Ra) | Color Rendering Index | – | As defined by CIE, R1~R8 represent the value of eight standard colors, while CRI(Ra) is the average value of R1~ R8. The value 100 indicates the best quality of light source, while the value 0 indicates the worst quality of light source. |
| R1、R2、R3…R15 | 15 standard colors of color rendering index. | – | R1:Light grey-red, R2: Dark grey-yellow, R3: Saturated yellow-green, R4: Middle yellow-green, R5: Light yellow-green R6: Light blue, R7: Light purple-blue, R8: Light red-purple, R9: Saturated red, R10: Saturated yellow, R11: Saturated yellow, R12: Saturated yellow, R13: White skin color, R14: Leaf green, R15: Yellow skin color |
| Lux | lluminance | lx | It is the light flux received by each unit area. |
| Λp | Peak Wavelength | nm | It is the wavelength with the highest power in the measured spectrum. |
| ΛpV | Peak Wavelength Value | mW/m2 | It is the highest power in the measured spectrum. |
| Λd | Dominate wavelength | nm | The dominant wavelength is used to express the color of the measured light. It could be hybrided by the spectrum color of the wavelength and the standard illuminant E(x,y = 0.333, 0.333). |
| I-Time | Integration time | us | The integration time measured by the spectrometer. |
| X,Y,X,Y,Z | CIE1931 color coordinate | – | Chromaticity chart CIE1931 by Commission International de l’Eclairage (CIE) Represent light color with plane (2-dimension) coordinates (x, y). |
| U’,V’ | CIE1976 color coordinate | – | Chromaticity chart CIE1976 by CIE Represent light color with plane (2-dimension) coordinates (u’, v’). |
| Duv | CIE1960 uv color coordinate difference | – | It is the uv distance between CIE1960 coordinate and the Planck’s blackbody radiation with the same color temperature. The value close to 0 indicates the color temperature and color are closer to that of the blackbody radiation. The positive value indicates it is above the blackbody radiation, while the negative value indicates it is below the blackbody radiation. |
| Δx | CIE1931 color coordinate difference | – | It is the x difference between CIE1931 coordinate and the Planck’s blackbody radiation with the same color temperature. |
| Δy | CIE1931 color coordinate difference | – | It is the u’ difference between CIE1976 coordinate and the Planck’s blackbody radiation with the same color temperature. |
| Δu’ | CIE1976 color coordinate difference | – | It is the u’ difference between CIE1976 coordinate and the Planck’s blackbody radiation with the same color temperature. |
| Δv’ | CIE1976 color coordinate difference | – | It is the v’ difference between CIE1976 coordinate and the Planck’s blackbody radiation with the same color temperature. |
| Fc | Footcandle | fc | It is based on the unit lm/ft2. |
| Purity | Color purity | % | It is the percent of the dominant wavelength in the standard illuminant. The closer the color purity is to 100%, the closer it is to the dominant wavelength. |
| PPFD | Photosynthetic Photon Flux Density | μmol/(m2*s) | It is the Photosynthetic Photon Flux Density defined in 400~700nm. |
| PFD-R | PFD in red field | μmol/(m2*s) | PFD in range of 600~700nm. |
| PFD-G | PFD in green field | μmol/(m2*s) | PFD in range of 500~600nm. |
| PFD-B | PFD in blue field | μmol/(m2*s) | PFD in range of 400~500nm. |
| PFD | Photosynthetic Photon Flux Density | μmol/(m2*s) | Number of photons in range of 380~780nm subjected by unit area in unit time. |
| PFD-UV | PFD in UV field | μmol/(m2*s) | PFD in range of 380~400nm |
| PFD-FR | PFD in FR field | μmol/(m2*s) | PFD in range of 700~780nm |
| CQS | Color Quality Scale | – | CQS is a new light source quality parameter developed by NIST for the new solid-state lighting markets. Addressing CRI, assess light source with the 15 new colors: with a scale of 0-100, scores 100 suggest the best quality and zero the worst. |
| GAI | Gamut Area Index | – | The Gamut Area Index is the ratio between the area of the eight standard colors (R1~R8) on CIE1976 coordinate measured by CRI and the area measured with the standard illuminant E(x,y = 0.333, 0.333). The higher the value is, the more saturated and bright the color is. |
| TLCI | Television Lighting Consistency Index | – | The parameter is defined by referring to European Broadcasting Union (EBU), which is used to evaluate the light source under for television lighting. |
| IRR | Irradiance | W/m2 | It is the irradiance within the range of the wavelength specified in the specification. |
| S/P (SP-Ratio) | Scotopic vision / photopic vision ratio | – | The sensitivity of human eyes varies with the light of different wavelength. It can get the data such as illuminance based on the brightness function. However, the brightness function is different for human eyes under high brightness and low brightness. Therefore, it defines the ratio of photopic vision under high brightness and scotopic vision under low brightness, which is called S/P ratio. |
| BIN | – | – | To classify the chromaticity of LED, ENERGY STAR combines with ANSI C78.377 standard to classify various classes and make uniform BIN types. So the user may distinguish the chromaticity of LED products easily. |
| SDCM | Standard Deviation Color Matching | – | SDCM has the same meaning with that of Macadam Ellipse. The color within Macadam Ellipse (SDCM=1) drawn on the coordinate can’t be identified by human eyes. |
| TRANSMIT | Transmittance | % | The transmittance is defined as (the radiant flux transmitted/the radiant flux received)x100 %, based on which the wavelength response can be obtained. |
| Rf / Rg | TM30 Rf / TM30 Rg | – | It is a rating method proposed by IES for the performance of light source. Different from 8 standard colors, it defines 99 standard colors to present the performance of various wavelengths. Rf represents the similarity between the target light source and the reference light source under the standard colors. The value 100 represents it is identical, while the value 0 represents great difference. Rg represents the saturation difference between the target light source and the reference light source under the standard colors. The value 100 represents the saturation is the same, while the value larger than 100 represents saturation is higher, and the value smaller than 100 represents saturation is lower. Moreover, it could identify the difference more obviously through the color vector diagram and the color tolerance diagram. |
| Flicker Idx | Flicker index | – | Flicker index= Area above the mean value /area below the mean value. Higher value represents obvious flicker. |
| Fpercent (Pct Flicker) | Flicker percent | % | Flicker percent=(Maximum value-minimum value)/ ( Maximum value + minimum value). Higher value represents obvious flicker. |
| SVM | Stroboscopic Effect visibility Measure | – | SVM is an index used to quantify the flicker effect. Higher value represents obvious flicker effect. |
| Frequency | Flicker Frequency | Hz | It is the flicker rate of the measured light, or the frequency shown per second. |
| Twave | Flicker Cycle | ms | It is the countdown of the flicker frequecny of the measured light, or the time of one flicker. |
| RMS(%) | Flicker square root | % | Flicker RMS is the square root of the average of a set of squares of statistical data. |
| RMS(DB) | Flicker square root | dB | Flicker RMS is the square root of the average of a set of squares of statistical data. |
| Avg | – | V | Waveform average. |
| Min | – | V | Waveform minimum. |
| Max | – | V | Waveform maximum. |
| Min/Max (%) | – | % | Waveform minimum / maximum. |
| Min/Max (DB) | – | dB | Waveform minimum / maximum. |
| Flicker Risk | – | – | The flicker risk model provides users with risk value of target light source according to IEEE PAR 1789-2015 flicker safety specification standards. |
| EB | Blue light weighted irradiance | W/m2 | The IEC62471 specification has blue light damage spectral function B (λ) built in. Determine major scope of blue light damage to human eyes with this function and factor in the light source spectral irradiance to obtain blue light radiation damage irradiance. |
| Kbv | Blue light hazard efficacy of luminous radiation | W/lm | Based on Kbv = EB/E (blue light hazard radiance, EB, and total luminance of the light source) to analyze individual light source spectrum radiation and level of blue light injury on human eyes. |
| RG | BLH Risk Group | – | Define the four RG grades of blue light damage risk according to the maximum exposure time (the maximum safe time for retina under direct exposure to light source) measured by blue light radiance. |
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