I'd just lose the daylight system and use manual lighting. the Sunlight and daylight systems are mainly designed for doing architectural visualisations of how a proposed development will look at different times of day in an accurate way. Sunlight for example is just a standard directional light and the daylight system is a combination of a max skylight and either a mental ray sunlight, ies sun or a standard directional.
For a night scene (in scanline) I would just use a directional light that is almost black or dark blue, maybe a max skylight and light tracer for some GI, setting the sky colour to a dark blue also. then use some practical lights in the scene things like windows or street lamps or a fire. or a combnation of these. You could lose the moonlight idea altogether and just light it with some attenuated practical lights, then add some very low level fill lights in the form of target spotlights or omnis. Whenever you start lighting its helpfull to think about the keylight first, what is the most obvious light source? At night it could be the moon, but it could also be a desk lamp or an open fireplace, or a cars headlights. once the key is established and looks good its just a matter of filling it out and adding highlights etc..

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It's probably not the answer you want to hear, but I agree with Tyson. It's a lot easier to get good results just using standard lights and you'll have more control over the look of the scene.

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[Link to www.3dprevis.com]

Cheers,
Odly enough i got the scene working again.. not sure what was wrong with it ... but i will keep what u have said in mind and ditch the daylight for my next scene

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