In addition to standard visual requirements, what technical factor must be sufficient for an illuminated sign to function reliably?

Answer

The luminance contrast between the graphic and the background

Sufficient luminance contrast between the illuminated graphic and the surrounding background is essential to ensure the sign remains visible across various ambient light conditions, from bright sunlight to total blackout.

In addition to standard visual requirements, what technical factor must be sufficient for an illuminated sign to function reliably?

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