Nico Rosberg says the Bahrain Grand Prix is going to be "a whole new challenge" due to racing under the lights.

FP2 took place after sunset on Friday and saw track and air temperatures drop, with the track temperature some 15C lower than in FP1. Rosberg said getting the tyres to work was not too big an issue but that new challenges had appeared as a result of the timing of the race, with data from testing now having little value.

"It worked out well," Rosberg said. "I was going well out there. Tyre temperatures are going to be less of an issue now in these conditions, it's more dropping out of the window and getting too cold at the end of the stint which is going to be a bit of a thing here.

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"The whole set-up, everything we have to do differently now because we're driving at a different time of the day. So the whole testing that we did at this track is not really relevant any more, and that just makes it a whole new challenge and very interesting."

Having been second quickest in both sessions, Rosberg said he still had work to do before he is happy with his car.

"It's work in progress, it's completely unusual circumstances out there because it's very, very cold, so it's all about adapting and getting the set-up right to prepare for Sunday but I was feeling comfortable out there."

Asked about the experience under the lights, Rosberg admitted it made driving slightly more difficult.

"From visibility-wise it's very similar to Singapore. It's a bit more difficult in the dark with the glare and everything."