[DaveNP]

Whilst I'd usually agree with the thought that you can't have too much light I do find on a sunny day that working under the car becomes harder as the contrast of the direct sunlight and the shadows is that much greater, so for the carport I'd go for a lot of distributed light such as the led battens but a good led portable worklight too, probably wired because you know the battery will run out just before you finish the job.