Question 1

What is a nit and when is it used?

Accepted Answer

A nit equals 1 candela/m², measuring display brightness. TVs: 100-400 nits. HDR: 1000+ nits. OLED: 500-800 peak. Higher nits = better visibility in bright rooms.

Question 2

Why are foot-lamberts still used?

Accepted Answer

Cinema industry standard: 16 fL for SDR, 48 fL for HDR. 1 foot-lambert = 3.426 nits. It represents luminance from a perfect diffuser at 1 foot-candle.

Question 3

What's the difference between lumens and lux?

Accepted Answer

Lumens measure total light output from a source. Lux measures light arriving at a surface. Same lumens in a smaller area = higher lux.

Question 4

How do I convert old wattage to lumens?

Accepted Answer

Roughly: 40W incandescent ≈ 450 lumens, 60W ≈ 800 lumens, 100W ≈ 1600 lumens. LED equivalents use 80-90% less power for same lumens.

Nits to Foot-Lamberts Converter

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