Convert Foot-candle to Lumen per cm²

📜 Origins

The lux was defined in 1889 at the International Congress of Electricians, based on the lumen (light output).

⚡ Historical Highlight

Edison's 1879 light bulb produced about 1.4 lumens per watt. Modern LEDs produce 100+ lumens per watt!

🎯 Fun Facts

• •Full moonlight provides about 0.25 lux, while direct sunlight is 100,000 lux - a 400,000× difference!
• •The human eye can adapt to light levels from 0.001 lux (starlight) to 100,000 lux (sunlight).
• •Office lighting standards recommend 300-500 lux for general work areas.

🏛️ Archaeological Discovery

Ancient lighthouses like Alexandria's Pharos (280 BCE) used polished bronze mirrors to amplify firelight, visible 50km away.

🚀 Modern Applications

Smartphones measure lux to automatically adjust screen brightness. Security cameras use it to switch to night vision mode.