obsolete chlorophyllide b:geranyl-geranyl diphosphate geranyl-geranyltransferase activity (obsolete GO:0102753)
OBSOLETE. Catalysis of the reaction: H+ + chlorophyllide b(1-) + 2-trans,6-trans,10-trans-geranylgeranyl diphosphate = geranylgeranyl-chlorophyll b + diphosphoric acid.