BSI PD IEC/TR 62778:2014
$167.15
Application of IEC 62471 for the assessment of blue light hazard to light sources and luminaires
| Published By | Publication Date | Number of Pages |
| BSI | 2014 | 42 |
This Technical Report brings clarification and guidance concerning the assessment of blue light hazard of all lighting products which have the main emission in the visible spectrum (380 nm to 780 nm). By optical and spectral calculations, it is shown what the photobiological safety measurements as described in IEC 62471 tell us about the product and, if this product is intended to be a component in a higher level lighting product, how this information can be transferred from the component product (e.g. the LED package, the LED module, or the lamp) to the higher level lighting product (e.g. the luminaire).
A summary of recommendations to assist the consistent application of IEC 62471 to light sources and luminaires for the assessment of blue light hazard is given in Annex C.
NOTE It is expected that HID and LED product safety standards will make reference to this Technical Report.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 4 | CONTENTS |
| 6 | FOREWORD |
| 8 | 1 Scope 2 Normative references 3 Terms and definitions |
| 12 | Tables Table 1 – Correlation between exposure time and risk group |
| 13 | 4 General |
| 14 | 5 Spectrum, colour temperature, and blue light hazard 5.1 Calculation of blue light hazard quantities and photometric quantities from emission spectra |
| 15 | Figures 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 |
| 16 | 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 |
| 17 | 5.2 Luminance and illuminance regimes that give rise to tmax values below 100 s 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 |
| 18 | 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 |
| 19 | 6 LED packages, LED modules, lamps and luminaires |
| 20 | 7 Measurement information flow 7.1 Basic flow |
| 22 | 7.2 Conditions for the radiance measurement Figure 6 – Relation of illuminance E, distance d and intensity I |
| 23 | Figure 7 – Flow chart from the primary light source (in blue) to the luminaire based on this light source (in amber) |
| 24 | 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 |
| 25 | Annex A (informative) Geometrical relations between radiance, irradiance and radiant intensity Figure A.1 – Schematic image of the situation considered in Annex A |
| 27 | Annex B (informative) Distance dependence of tmax for a certain light source |
| 28 | 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 |
| 29 | 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 C.1 General C.2 Situation of RG0 or RG1 classification not requiring radiance or irradiance measurement C.2.1 Boundary conditions C.2.2 True luminance values giving risk group not greater than RG1 |
| 30 | C.2.3 Illuminance values giving risk group not greater than RG1 Figure C.1 – Luminance values from Table C.1 in relation to the RG1/RG2 border as function of correlated colour temperature Table C.1 – Luminance values giving risk group not greater than RG1 |
| 31 | C.3 Situation for the classification of light sources larger than 2,2 mm and luminaires using these light sources Figure C.2 – Illuminance values from Table C.2 in relation to the RG1/RG2 border as function of correlated colour temperature Table C.2 – Illuminance values giving risk group not greater than RG1 |
| 32 | 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 |
| 33 | Annex D (informative) Detailed assessment of arrays and clusters of primary light sources, comprised of LED packages D.1 General D.2 Approach D.2.1 Step by step assessment Table D.1 – Applicability of steps 1 to 6 |
| 34 | D.2.2 Type of arrays and additional steps Figure D.1 – Examples of secondary lenses with identical light distribution and alignment |
| 35 | 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 |
| 36 | D.2.3 Complete flowchart |
| 37 | D.3 Derivation of the formula for average radiance of the full array Figure D.4 – Complete flowchart of the detailed assessment of arrays and clusters of primary light sources |
| 39 | Bibliography |
