"Azi avem becuri puternice."

Translation: Today we have strong light bulbs.

[ceaer]

What does this mean? Like high-wattage light bulbs?

[coto.i]

I guess it depends on which side of the bulb you are, to say so. In my end-user opinion, "puternice" refers to the perceived intensity of the outputted light - the benefits -, rather than the inputted current, whereas an engineer might see the technical details first, even though the two correlate positively.

[Mapka15]

Can "azi" also mean: " nowadays"?

[coto.i]

Yes. To be even more clear we say "în ziua de azi" (literally in the day of today).

[GrantHanha]

Thanks for that coto.i
Today has more than one connotation , such as ' today ' = this very day or ' today ' = in these current times.