Not sure exactly what your experimental setup looks like...did you settle on a bowl/tank to use?I just started looking again at clip on light prices....... most of are $80 😅😅😩
But for my new bowl experiment I bought a $10 lamp from Target and just put a bog standard LED bulb (same ones I use for all my house lights) in it and...well everything seems to be growing fine lol. Eventually I want to swap it out for a cooler color bulb because I believe that range of light is better for the plants. But I've not been too motivated to do so since everything is working out fine for now. So especially for a smaller setup I think you can get away with a lot less than $80 for lighting.