( ( Luminescence Light ) ( ( is ( ( a form ) ( of energy ) ) ) . ) )
(ROOT (S (NP (NNP Luminescence) (NNP Light)) (VP (VBZ is) (NP (NP (DT a) (NN form)) (PP (IN of) (NP (NN energy))))) (. .)))
Luminescence Light is a form of energy.
(ROOT (S (NP (NP (NNP Producing) (NN light)) (PP (IN without) (NP (NN heat)))) (VP (VBZ is) (VP (VBN called) (S (ADJP (JJ luminescence))))) (. .)))