( ( The light ) ( ( sticks ( produce ( ( a ( chemical luminescence ) ) ( for ( ( ( up to ) 24 ) hours ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN light)) (VP (VBZ sticks) (VP (VB produce) (NP (NP (DT a) (JJ chemical) (NN luminescence)) (PP (IN for) (NP (QP (IN up) (TO to) (CD 24)) (NNS hours)))))) (. .)))
The light sticks produce a chemical luminescence for up to 24 hours.
(ROOT (S (NP (NP (NNP Producing) (NN light)) (PP (IN without) (NP (NN heat)))) (VP (VBZ is) (VP (VBN called) (S (ADJP (JJ luminescence))))) (. .)))