If [Cu(H₂O)₄]²⁺ absorbs a light of wavelength 600 nm for d-d transition, then the value of octahedral crystal field splitting energy for [Cu(H₂O)₆]²⁺ will be ____________ $\times$ 10^$-$21 J. [Nearest Integer]

(Given : h = 6.63 $\times$ 10^$-$34 Js and c = 3.08 $\times$ 10⁸ ms^$-$1)