Illumination Converter
Convert illumination measurements.
Popular Illumination Conversions
Complete List of Illumination Units for Conversion
1 Foot-candle [fc] = 10.7639 Lux [lx]
1 Phot [ph] = 10000.0 Lux [lx]
How this illumination converter works
Lux (lx) is used as the internal base unit. Every value you enter is first converted to Lux using exact SI factors, then translated to the requested unit with the same data pulled from the SI Brochure and NIST SP 811.
Key illumination relationships
- 1 Foot-candle = 10.7639 Lux
- 1 Phot = 10,000 Lux
Where illumination units are used
Lighting designers, display manufacturers, and imaging scientists track these optical quantities when tuning sensors, screens, and illumination systems. The illumination converter covers real-world units such as Lux and Foot-candle, giving teams a trusted reference when cross-checking data between labs, suppliers, and regulatory filings.
Tips for accurate illumination conversions
- Always verify the unit symbol in your worksheet—this converter normalizes values through Lux, which is the SI reference for illumination measurements.
- When jumping between Lux and Foot-candle, watch metric prefixes and rounding. A misplaced milli-, micro-, or kilo- prefix can produce errors of several orders of magnitude.
- Document the context (test conditions, instrument resolution, uncertainty) whenever you publish illumination conversions so coworkers and auditors can reproduce your results.
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