The buds will definitely get bigger, ESPECIALLY if you switch to HPS. Metal Halides aren't really conducive to bud production, but that doesn't mean they wont bud.

anyway, the plant will continue to create buds right up until harvest. if you're at week 5, i'd say they'll get about 25% bigger before harvest, depending on strain. some strains flower for up to 12 weeks, so if thats the case, they will likely get bigger than that. Thats just an estimated guess though.

good luck with the rest of your grow. :thumbsup: