( uses ( visible ( light ( only a. ) ) ) )
(ROOT (SINV (VP (VBZ uses)) (NP (CD visible) (JJ light) (JJ only) (NN a.))))
uses visible light only a.
(ROOT (S (NP (PRP We)) (VP (VBP call) (NP (DT the) (JJ only) (NN light)) (SBAR (IN that) (S (NP (NNS people)) (VP (MD can) (VP (VB see) (NP (JJ visible) (NN light))))))) (. .)))