Mirek probobly has a better solution looking at his shading networks, but i will say it nonetheless:p :
Give the color of the spotlight a yellowish tint (but still white)
increase the drop off rate(edit: use linear decay and up the intensity of the spotlight, make the penumra angle like 5 and your cone angle like 35 orso), and maybe even some lightfog.
If you want your wooden fence to look a bit more real, slide the color a bit more to grey in the color chooser.

looking forward seeing some more of this