During a power failure, a votive candle contained in glass can provide bright, continuous light for many hours and even days. A flashlight may only work for a few hours. The flame on a votive candle is also safe from drafts and sudden blasts of wind. Votive candle are widely available in grocery stores.
If you’re painting a porch that has railings, paint the railings first. Follow with the outside edges of the floor, working toward the door or steps.