I can never fathom why Strata Managers have this attraction to Special By-Laws in circumstances where a simple authorisation from the O/C, incorporating a statement about who's responsible for on-going maintenance and repairs, would suffice.
In your case, the false ceiling is common property and the existing light fitting is yours, so just have a licensed electrician replace that fitting with a combined light / heat lamp and get on with your (warmer) life.
Then, as Jimmy suggests, make moves to have that L&PI Memorandum adopted at your next AGM.