Lux Exposure Limits

Light damage is cumulative and irreversible. Use this tool to calculate how long you can safely display a signed item based on your room's lighting conditions. Read our fading prevention guide.

JavaScript is required for interactive calculation. Manual reference:

Museum standard limit for sensitive paper/ink: 50,000 lux-hours per year.
Formula: 50,000 / (Current Lux level) = Max hours per year.

Measured Light Level (Lux)

Use a light meter app on your phone at the exact location of the item.

Ink / Material Sensitivity

Maximum Annual Display

hours/year

Max Daily Display (365 days)

hours/day

WARNING: Light levels are too high for continuous display. Consider motion-sensor lighting or rotating the item into dark storage for 9 months of the year.