I lit a music video last week, and one of the setups called for lighting as if it was 'twilight'. I knew just using CTB to get the blue light of twilight wouldn't work, so I did some research and ended up buying some Lee Filters 161 Slate Blue. I used Slate Blue on some HMIs, and softened and diffused the light as much as possible to get the soft blue light that you see just after sunset. I was quite happy with the outcome, but it wasn't really the kind of blue I was after. I was wondering if anyone else has had experience using special colour gels to light for twilight? What kind of setups did you use? With the power of grading nowadays, is it easier to just fix the colour in post? I guess it's an interesting debate, but I do like to get what I want in camera, so that minimal things have to be changed in post.
More about the shoot on my blog.