Secondhand anglepoise lamps with clamps so they can be attached up high for bigger plants, and the cheapest and brightest white bulbs I can find in multipacks, are what I use.

I have 60 plants (currently), mostly tropicals and succulents, and they’ve been thriving under these lamps and mostly without natural light for nearly a decade now. My monstera is fucking massive, to the point where every year or so I remove a section of at least 3 or 4 leaves to keep it able to fit in my flat.

You really don’t need to be shelling out for fancy lamps or bulbs to have most plants grow indoors!