Yes, CANDLES is a Scrabble word!

Letter values in Scrabble US: C 3, A 1, N 1, D 2, L 1, E 1, S 1.

Is it a valid word?

CANDLES is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

stick of wax with a wick in the middle
the basic unit of luminous intensity adopted under the Systeme International d'Unites; equal to 1/60 of the luminous intensity per square centimeter of a black body radiating at the temperature of 2,046 degrees Kelvin

Also: wax light, standard candle.

Not playable in Scrabble US: CD.