1 Gcd (Gigacandela) is equal to 999,999,999.9999999 lm/sr (Lumen per Steradian). To convert from Gigacandela to Lumen per Steradian, multiply by 999,999,999.9999999 or divide by 0.000000001.
Nine Hundred Ninety-Nine Million Nine Hundred Ninety-Nine Thousand Nine Hundred Ninety-Nine Point Nine Nine Nine Nine Nine Nine Nine Lumen per Steradian