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PD IEC/TR 62778:2014 Application of IEC 62471 for the assessment of blue light hazard to light sources and luminaires, 2014
- 30304759-VOR.pdf [Go to Page]
- CONTENTS
- FOREWORD
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 General
- 5 Spectrum, colour temperature, and blue light hazard [Go to Page]
- 5.1 Calculation of blue light hazard quantities and photometric quantities from emission spectra
- 5.2 Luminance and illuminance regimes that give rise to tmax values below 100 s
- 6 LED packages, LED modules, lamps and luminaires
- 7 Measurement information flow [Go to Page]
- 7.1 Basic flow
- 7.2 Conditions for the radiance measurement
- 7.3 Special cases (I): Replacement by a lamp or LED module of another type
- 7.4 Special cases (II): Arrays and clusters of primary light sources
- 8 Risk group classification
- Annex A (informative) Geometrical relations between radiance, irradiance and radiant intensity
- Annex B (informative) Distance dependence of tmax for a certain light source
- Annex C (informative) Summary of recommendations to assist the consistent application of IEC 62471 for the assessment of blue light hazard to light sources and luminaires [Go to Page]
- C.1 General
- C.2 Situation of RG0 or RG1 classification not requiring radiance or irradiance measurement [Go to Page]
- C.2.1 Boundary conditions
- C.2.2 True luminance values giving risk group not greater than RG1
- C.2.3 Illuminance values giving risk group not greater than RG1
- C.3 Situation for the classification of light sources larger than 2,2 mm and luminaires using these light sources
- C.4 Situation for the classification of light sources smaller than 2,2 mm and luminaires using these light sources
- C.5 Situation for the classification of light sources that pose practical difficulties in measurements at 200 mm
- Annex D (informative) Detailed assessment of arrays and clusters of primary light sources, comprised of LED packages [Go to Page]
- D.1 General
- D.2 Approach [Go to Page]
- D.2.1 Step by step assessment
- D.2.2 Type of arrays and additional steps
- D.2.3 Complete flowchart
- D.3 Derivation of the formula for average radiance of the full array
- Bibliography
- Figures [Go to Page]
- Figure 1 – Blue light hazard efficacy of luminous radiation, KB,v, for a range of light sources from different technologies, and for a few typical daylight spectra
- Figure 2 – Comparison between the curves involved in calculating KB,v (the photopic eye sensitivity curve and the blue light spectral weighting function) and the CIE 1931 Y and Z curves involved in calculating the CIE 1931 x, y colour coordinates
- Figure 3 – Correlation plot between the quantity (1 – x – y)/y,
calculated from the CIE 1931 x, y colour coordinates, and the
value of KB,v, for all the spectra analysed to generate Figure 1
- Figure 4 – Estimate of the luminance level where LB = 10 000 W/(m2.sr),
border between RG1 (tmax > 100 s) and RG2 (tmax < 100 s) in the
large source regime, as a function of CCT
- Figure 5 – Estimate of the illuminance level where EB = 1 W/m2,
border between RG1 (tmax > 100 s) and RG2 (tmax < 100 s)
in the small source regime, as a function of CCT
- Figure 6 – Relation of illuminance E, distance d and intensity I
- Figure 7 – Flow chart from the primary light source (in blue) to the luminaire based on this light source (in amber)
- Figure A.1 – Schematic image of the situation considered in Annex A
- Figure B.1 – General appearance of tmax as a function of viewing distance d, for any light source with homogeneous luminance L and diameter D
- Figure C.1 – Luminance values from Table C.1 in relation to the RG1/RG2 border as function of correlated colour temperature
- Figure C.2 – Illuminance values from Table C.2 in relation to the RG1/RG2 border as function of correlated colour temperature
- Figure D.1 – Examples of secondary lenses with identical light distribution and alignment
- Figure D.2 – Examples of LED arrays with bare LED packages
- Figure D.3 – Evaluation whether one or more LED elements fall in 11 mrad field of view at distance d1
- Figure D.4 – Complete flowchart of the detailed assessment of arrays and clusters of primary light sources
- Tables [Go to Page]
- Table 1 – Correlation between exposure time and risk group
- Table C.1 – Luminance values giving risk group not greater than RG1
- Table C.2 – Illuminance values giving risk group not greater than RG1
- Table D.1 – Applicability of steps 1 to 6 [Go to Page]
