At the risk of dampening the romance put the candle out or move it well out of your line of sight. Facing bright sunlight, while sitting in a restaurant, for instance, can be blinding. Think about getting the sunlight behind you before you sit down. If you don't notice it until you're seated explain your discomfort to whoever you're with and swap places with them. If you're in a revolving restaurant, squint and bear it.
Light bulbs lose power with use.
To maintain a high light level you may want to replace them before they burn out. Dust on light bulbs significantly reduces their efficiency. This particular tip will seem an exaggeration to some. Some lighting tips Keep well-maintained flashlights in critical drawers. Matching socks, sorting cutlery, locating broaches and so on can be made much easier.