Yes, CANDELAS is a Scrabble word!

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

Is it a valid word?

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

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: standard candle.

Not playable in Scrabble US: CD.