Led lamp with slow decay red phosphor resulting in cct variation with light output

A lighting device comprising:

• a light source configured to provide blue light source light;
• a layer of a first luminescent material configured to convert at least part of the light source light into first luminescent material light with light intensity in one or more of the green spectral region and yellow spectral region;
• a layer of a second luminescent material configured to convert at least part of the light source light into second luminescent material light with light intensity in the red spectral region;
• wherein the light source is covered by the layer of the second luminescent material, followed by the layer of the first luminescent material,
• wherein the integrated spectral overlap between the absorption curve of the second luminescent material with the emission spectrum of the light source light is at least four times larger than the integrated spectral overlap between the absorption curve of the second luminescent material with the emission spectrum of the first luminescent material,
• a light exit face;
• wherein:
• the lighting device is configured to provide lighting device light downstream from said light exit face, wherein the lighting device light comprises one or more of said light source light, said first luminescent material light, and said second luminescent material light;
• wherein the second luminescent material is configured to be at least partly saturated with light source light at or above at least 50% of nominal operation power of the lighting device.