Furthermore, I have calculated curves for various adaptation luminances. The adaptation luminance is the luminance that the eye adjusts itself to. It can be regarded as an average luminance across the whole field of vision. In rooms where photoluminescent strips are the sole source of light, the adaptation luminances will be several decades lower than the luminance on the photoluminescent strips itself. Therefore the curves with the lowest luminance values are the significant ones in this context. The curves for the adaptation luminances La > 1 mcd/m2, is relevant when other light sources are present in the room in addition to the strip.
In comparing the calculation of my curves with the curve in Annex E, we see that the requirements in ISO 15370 are not in accordance with the contrast threshold for visibility. It goes without saying that a law proposal will have to be well over the visibility limit, but I do not see the reason for demanding an increase of 21 times increase of luminance requirement when the strip width changes from 8 to 3,5 cm. Even in the presence of smoke, the curve for visibility will not be like the one shown in annex 3.
The most critical factor for visibility in the presence of smoke is the distance, not the luminance.
I hereby enclose the book "A Method for Calculating Visibility in Smoke" as an addition to the specialist knowledge whereupon I have based this comments.
