As we know One lm/(cm²·sr) is equal to 0.0014641288 W/(cm²·sr) (1 lm/(cm²·sr) = 0.0014641288 W/(cm²·sr)).

To convert Lumen/Square Centimeter/Steradian to Watt/Square Centimeter/Steradian (at 555 nm), multiply your lm/(cm²·sr) figure by 0.0014641288.

Example : convert 25 lm/(cm²·sr) to W/(cm²·sr):

25 lm/(cm²·sr) = 25 × 0.0014641288 W/(cm²·sr) = W/(cm²·sr)

To convert Watt/Square Centimeter/Steradian (at 555 nm) to Lumen/Square Centimeter/Steradian, divide your W/(cm²·sr) figure by 0.0014641288.

Example : convert 25 W/(cm²·sr) to lm/(cm²·sr):

25 W/(cm²·sr) = 25 ÷ 0.0014641288 lm/(cm²·sr) = lm/(cm²·sr)