( ( An LED ) ( ( ( converts ( electrical energy ) ) ( to ( light energy ) ) ) . ) )
(ROOT (S (NP (DT An) (NNP LED)) (VP (VBZ converts) (NP (JJ electrical) (NN energy)) (PP (TO to) (NP (JJ light) (NN energy)))) (. .)))
An LED converts electrical energy to light energy.
(ROOT (S (NP (DT A) (JJ light) (NN bulb)) (VP (VBZ converts) (NP (JJ electrical) (NN energy)) (PP (TO to) (NP (JJ light) (CC and) (JJ thermal) (NN energy)))) (. .)))