Toadi He did one a few occasions, mostly part of a seascape like 'Tropical seascape (S12E9), where the bottom white half of the canvas was done with LC.
Also for 'Frosty winter morn' (S23E1) where Bob used an even mixture of LW and LC for the entire canvas.
The LW gives a more pastelled look to the painting, the LC a more hardened colouring. A matter of taste I think!