Aye, I've tried all kinds of lightnings for Bryce, and natively, the terrain modeler is perfect. BUT...! KPT Lightning is way sicker, and pretty much levels the competition as far as I can tell for realistic, animateable lightning. Don't use it in post, make the lightning and import it into your scene, then use a few ranged radial lights to light it up. Don't use external colors, merely the lightning image as a transparency map... (blend transparency).... Or use it as a height-map for a terrain-based Lightning. You'll see some lightning in my new works...