As we know One lm/(ft²·sr) is equal to 1 cd/ft² (1 lm/(ft²·sr) = 1 cd/ft²).

To convert Lumen/Square Foot/Steradian to Candela/Square Foot, multiply your lm/(ft²·sr) figure by 1.

Example : convert 25 lm/(ft²·sr) to cd/ft²:

25 lm/(ft²·sr) = 25 × 1 cd/ft² = cd/ft²

To convert Candela/Square Foot to Lumen/Square Foot/Steradian, divide your cd/ft² figure by 1.

Example : convert 25 cd/ft² to lm/(ft²·sr):

25 cd/ft² = 25 ÷ 1 lm/(ft²·sr) = lm/(ft²·sr)