What's in it for them? Explain the benefit of this change and turn it into positive public relations. For instance, does it help keep fees economical, reduce the reasons maintenance enters units, allows staff to focus on more important tasks, etc.
Consider easing into this transition by using your business status to purchase wholesale bulbs. You control the narrative better by making available to residents at cost as a temporary convenience. It's not a great time during the announcement to risk a nickel/dime scenario by making a small profit on bulbs.