Catalyzes the conversion of divinyl chlorophyllide to monovinyl chlorophyllide. Reduces the 8-vinyl group of the tetrapyrrole to an ethyl group using NADPH as the reductant. The best substrate is (3,8-divinyl)-chlorophyllide a (DV-Chlidea). Very low activity with (3,8-divinyl)-protochlorophyllide a (DV-Pchlidea) and (3,8-divinyl)-magnesium-protoporphyrin IX monomethyl ester (DV-MPE). No activity with (3,8-divinyl)-chlorophyllide b (DV-Chlideb), (3,8-divinyl)-magnesium-protoporphyrin IX (DV-Mg-Proto) and either (3,8-divinyl)-chlorophyll a (DV-Chla) or b (DV-Chlb). NADP(+) + protochlorophyllide a = 3,8-divinyl protochlorophyllide a + H(+) + NADPH Optimum pH is 7.0. Optimum temperature is 30 degrees Celsius. Porphyrin-containing compound metabolism; chlorophyll biosynthesis. Highly expressed in leaves, stems and flower buds. Detected in roots. Pale-green leaves with a reduced amount of chlorophylls a and b, and an accumulation of divinyl chlorophylls. Severe reduction of grana stacks in chloroplasts.