Convert Phot to Lumen per Square Foot
Enter the number of phots that you want to convert to lumens per square foot.
How to Convert Phots to Lumens per Square Foot
The phot and lumen per square foot are both units of illuminance. 1 phot equals 929.03039997 lumens per square foot. This means to convert phots to lumens per square foot, you multiply by 929.03039997.
Formula
Step-by-Step Example
Convert 5 ph to lumens per square foot:
We need to convert phots to lumens per square foot
Since 1 ph = 929.03039997 lm/ft², multiply by 929.03039997
5 × 929.03039997 = 4645.1519999
5 ph = 4645.1519999 lm/ft²
Phot to Lumen per Square Foot Conversion Table
Quick reference table for common phot to lumen per square foot conversions. Click any value for detailed calculation.
| Phots (ph) | Lumens per Square Foot (lm/ft²) |
|---|---|
| 0.1 ph | 92.903039997 lm/ft² |
| 0.5 ph | 464.51519999 lm/ft² |
| 1 ph | 929.03039997 lm/ft² |
| 2 ph | 1858.0607999 lm/ft² |
| 5 ph | 4645.1519999 lm/ft² |
| 10 ph | 9290.3039997 lm/ft² |
| 25 ph | 23225.759999 lm/ft² |
| 50 ph | 46451.519999 lm/ft² |
| 100 ph | 92903.039997 lm/ft² |
About These Units
Phot (ph)
The phot (ph) is the CGS unit of illuminance equal to 10,000 lux or 1 lumen per square centimeter. Very bright: full sunlight is about 10 phots. Found in older scientific literature. One phot = 929 foot-candles. Largely replaced by lux in modern usage.
Lumen per Square Foot (lm/ft²)
Lumens per square foot (lm/ft²) is identical to foot-candles. The defining relationship: one foot-candle = one lumen per square foot. Used in US lighting calculations: lumens needed = foot-candles × square feet. Standard in American architectural lighting design.
Frequently Asked Questions
How do I convert phots to lumens per square foot?
To convert phots to lumens per square foot, multiply the value by 929.03039997. For example, 10 ph = 9290.3039997 lm/ft².
How many lumens per square foot are in 1 phot?
1 phot equals 929.03039997 lumens per square foot.
What is the formula for phots to lumens per square foot?
The formula is: lm/ft² = ph × 929.03039997.