Just as a heads up to everyone, so not OP obviously; Never buy lamps that are marketed as grow lights; that is just a scam to sell you way overpriced lighting. You also generally don't need to buy these purple lights, because white lamps include these colors already, so unless you go for very specific effects, just buy a full spectrum light. I usually just do a search for suitable light temperature etc for my plants, probably around 4000 K or so, and then buy a led light. Don't buy lamps that can become hot, so as not to burn the plants.

@Naja_Kaouthia I use LED shop lights from the home improvement store. They were one of the cheapest options I’d found. They aren’t powerful enough to promote vigorous growth but they work well enough for starting seedlings and keeping anything alive.

I’ve got some Barrina T5 1ft grow lights that everybody on IKEA Greenhouse Club recommends. I checked the PPFD with Photone, directly under the centre of the light strip: 72.9 at 20cm away, 47.5 at 30cm away, 34.8 at 35cm away. They’ve served me very well; I’ve got plants in a living room that get very little natural light but with these lights they’ve been thriving!

For other plants, I’ve got some GE grow light bulbs. These ones I’ve screwed into table lamps for my smaller plants. For these bulbs, the PPFD measurements I got were 300 at 10cm away 100 at 20cm away (directly under the bulb).

Nothing useful to add here other than I'm in the same situation as you and I'm interested in hearing what people suggest! Also, I've heard that you can use just regular LED bulbs so I'm curious if anybody has experience with this and/or can recommend some cheap lightbulbs/clip-on bases.

Personally I use E27 PAR (38 degrees) LED lamps, 17 watt power. I have a mix of 3000 K and 4000 K. The reason for these specific lamps is that I found them at a discount and so I bought a large amount. It is nice that they are somewhat directional, so I can aim them at specific plants.

I have a few different ways of hanging the lights by the plants. Most recently, I have set up a rack this way:

The E27 clamps I bought 12 off Ali-Express: https://nl.aliexpress.com/item/4000793927858.html

The rack is a simple light weight plastic rack that I found in a discount store for $12.