at focal points, e.g. of refractors, lenses, reflectors or arrays of light sources

Full Title

Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters (coloured shades F21V1/00; elements characterised by cooling arrangements F21V29/502) > Elements containing photoluminescent material distinct from or spaced from the light source (shades F21V1/17; globes, bowls or cover glasses F21V3/08, F21V3/12; refractors F21V5/10; reflectors F21V7/26, F21V7/30; elements with provision for controlling the spectral properties or intensity F21V9/40) > characterised by the arrangement of the photoluminescent material > at focal points, e.g. of refractors, lenses, reflectors or arrays of light sources