Yes, the manufacturers we work with have lighting systems for both your deck and railings. They have several options and colors. Deck Lights require a GFCI weatherproof outlet to power them. This will need to be installed by a licensed Electrician.
Composite decking and railings have come a long way and now offer a virtually maintenance free decking experience. It is still recommended to do a light quick cleaning as needed, typically spring before the season.