New International Standards< CIE S 02 6/E:2018 CIE System for Metrology of Optical Radiation for ipRGC-Influenced Responses to Light> A quantification of the spectral impact is given, expressed using the retinoid equivalent daylight (D65) illuminance, Melanopic EDI (lx). [The WELL Building Standard Q2 2020 version] In a similar way, using the "retinoid equivalent lux”, That is, EML, as the equivalent lux value of ipRGC in five types of photoreceptor cells EML(Equivalent Melanopic Lux) quantified values and became a quantitative standard for their rhythmic lighting design.
Biological rhythms are controlled by rhythmic genes in the organism. At present, researchers generally believe that the main influencing factors of biological rhythms are time and light, time is unchangeable, while light can be regulated by humans, with different light quality and light quantity at different times of scientific distribution, so that most of the time people are in a healthy and good rhythm level, as one of the design goals of human-centered lighting
Functional features£º
• Measurement of strobe/waviness depth (optional)
• Measure bright visual illuminance
• Measure non-visual illuminance
• Diagonal angle can be set
Technical parameters of EDI illuminance meter
1. Based on standards or literature
• <CIE S 02 6/E:2018 CIE System for Metrology of Optical Radiation for ipRGC-Influenced Responses to Light>
• [The WELL Building Standard Q2 2020 version]
• Group standards: T/SIEATA000001-2020
• <Ranking evaluation for classroom lighting quality in primary and middle schools >
• Calculation method (Robert. Lucas et al.):
EML value = Km∫Ee(λ). Nz(λ)dλ. ∫ V(λ)dλ/ ∫ Nz(λ)dλ
EML - equivalent lux of retinoid
Km - constant, the maximum spectral photopic efficacy of bright vision
V(λ) - bright vision spectral photopic energy function
Ee(λ) - absolute spectral energy distribution
Nz(λ) - black-optics spectral photopic energy function
λ --spectral wavelength range: 380-780nm
Melanopic EDI - retinotopic equivalent daylight (D65) illuminance
Melanopic EDI=EML×γ (γ is a constant, γ=0.9063)
2. Measurement method: spectroscopic method
3. Measurement parameters:
o EDI illumination:
o Measurement range 0.5 - 200 000 edi
o Repeatability: ±0.5% FS
o Measurement accuracy: ±5.0% FS
o Reading resolution: 0.1 edi
*Minded visual illumination.
o Measurement range 0.5 - 200 000 lx
o Repeatability: ±0.5% FS
o Measurement accuracy: ±5.0% FS
o Inclination measurements:
Measurement range 0-180 degrees
Measurement accuracy: ±1.5 degrees
Take the value of the allowable angle error: ± 5 degrees
4. Electrical parameters:
Lithium battery specification 18650, rated voltage 3.7V,
Capacity 2200mAh, certified UN38.3.
Charging requirement: 5 ±0.4V, 1.0-3.0A
mini USB-US
Models and Functions:
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