ECN Forum Forums General Topics of the Trade General Discussion Area Porch light on WP box?

Can you mount a porch light on a WP box. Or are there decent looking fixtures designed to mount on WP boxes.
I've been asked to feed an outdoor receptacle for holiday lights from a switched entrance light. The light is mounted on a standard single gang sw. box in brick. The simplest solution seems to be to install a WP box over the old box and drop down with PVC to the new WP receptacle box. But I don't think the fixture will sit properly on a WP box.

Any ideas?

Thanks.