As we know One W/(cm²·sr) is equal to 683 cd/cm² (1 W/(cm²·sr) = 683 cd/cm²).

To convert Watt/Square Centimeter/Steradian (at 555 nm) to Candela/Square Centimeter, multiply your W/(cm²·sr) figure by 683.

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

25 W/(cm²·sr) = 25 × 683 cd/cm² = cd/cm²

To convert Candela/Square Centimeter to Watt/Square Centimeter/Steradian (at 555 nm), divide your cd/cm² figure by 683.

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

25 cd/cm² = 25 ÷ 683 W/(cm²·sr) = W/(cm²·sr)