Convert Foot-candles to Lumens per square yard
Convert Foot-candles (fc) to Lumens per square yard (lm/yd²) instantly and accurately.
Conversion Formula
lm/yd² = fc × 9
About Foot-candles
The foot-candle (fc) equals 1 lm/ft² ≈ 10.764 lx. Standard in North American lighting design: IESNA recommends 30-50 fc for general offices, 50-100 fc for retail displays, 12-16 fc for cinema screens. Still the dominant unit in the US, Canada and some other countries. 1 fc = 1/0.09290304 lx.
About Lumens per square yard
The lumen per square yard (lm/yd²) equals 1/0.83612736 lx ≈ 1.196 lx. Used occasionally in UK outdoor area lighting specifications alongside foot-candles. A 3 lx minimum car-park standard equals ~2.5 lm/yd²; a 100 lx sports-field requirement ~84 lm/yd². 1 lm/yd² = 1/0.83612736 lx.
Quick Reference Table
| Foot-candles (fc) | Lumens per square yard (lm/yd²) |
|---|---|
| 1 fc | 9 lm/yd² |
| 2 fc | 18 lm/yd² |
| 5 fc | 45 lm/yd² |
| 10 fc | 90 lm/yd² |
| 25 fc | 225 lm/yd² |
| 50 fc | 450 lm/yd² |
| 100 fc | 900 lm/yd² |