Convert Foot-lamberts to Apostilbs
Type the number of foot-lamberts that you wish to convert to apostilbs.
How to Convert Foot-lamberts to Apostilbs
The foot-lambert and apostilb are both units of luminance. 1 foot-lambert equals 10.763910416 apostilbs. This means to convert foot-lamberts to apostilbs, you multiply by 10.763910416.
Formula
Step-by-Step Example
Convert 5 fL to apostilbs:
We need to convert foot-lamberts to apostilbs
Since 1 fL = 10.763910416 asb, multiply by 10.763910416
5 × 10.763910416 = 53.81955208
5 fL = 53.81955208 asb
Foot-lambert to Apostilb Conversion Table
Quick reference table for common foot-lambert to apostilb conversions. Click any value for detailed calculation.
| Foot-lamberts (fL) | Apostilbs (asb) |
|---|---|
| 1 fL | 10.763910416 asb |
| 2 fL | 21.527820832 asb |
| 5 fL | 53.81955208 asb |
| 10 fL | 107.63910416 asb |
| 15 fL | 161.45865624 asb |
| 20 fL | 215.27820832 asb |
| 25 fL | 269.0977604 asb |
| 50 fL | 538.1955208 asb |
| 100 fL | 1076.3910416 asb |
About These Units
Foot-lambert (fL)
The foot-lambert (fL) equals 1/π candela per square foot ≈ 3.43 nits. The US cinema projection standard: movie theater screen 12-22 fL, IMAX 22 fL minimum, drive-in 4-8 fL. Also used in flight simulator displays and military cockpit specifications.
Apostilb (asb)
The apostilb (asb) equals 1/π cd/m² ≈ 0.318 nits. Represents the luminance of a perfect diffuser illuminated by 1 lux. Also called blondel. One apostilb ≈ 0.0929 foot-lamberts. Useful in theoretical calculations involving diffuse reflection.
Frequently Asked Questions
How do I convert foot-lamberts to apostilbs?
To convert foot-lamberts to apostilbs, multiply the value by 10.763910416. For example, 10 fL = 107.63910416 asb.
How many apostilbs are in 1 foot-lambert?
1 foot-lambert equals 10.763910416 apostilbs.
What is the formula for foot-lamberts to apostilbs?
The formula is: asb = fL × 10.763910416.