Helkurid peavad mõõtmetelt ja vormilt ning kolorimeetriliste, fotomeetriliste ja mehaaniliste omaduste poolest vastama lisades 5-11 ja lisas 13 toodud nõuetele. Katsetuste läbiviimise nõuded on toodud lisades 4, 14 ja 16.
For verifying the colorimetric characteristics of these filters, a source of white light at a colour temperature of 2854° K (corresponding to illuminant A of the International Commission on Illumination (CIE)) shall be used.
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