obsolete chlorophyllide-b:phytyl-diphosphate phytyltransferase activity (obsolete GO:0102754)
OBSOLETE. Catalysis of the reaction: H+ + chlorophyllide b + (E)-3,7,11,15-tetramethylhexadec-2-en-1-yl diphosphate = chlorophyll b + diphosphoric acid.