"Modern ceiling fixtures come with safety recommendations re wattage."
..... Yes but see Dick's post above!

No light bulb is going to weigh so much the fitting will not hold them!
Just be sure to check the fitting's type, S.E.S. (Small Edison Screw) is the most common by far! Also be aware the new lamps are larger than the old candle bulbs! They also light up slowly to full brilliance and can have some odd "coloring" to them if you buy cheap ones.