I prefer to build my own grow lights since I can have full control over the output. The parts will be arriving late unfortunately, and the suspicious $5 50W (30W as measured) grow light (that I ordered out of curiosity) arrived first. The seeds I've planted have sprouted exactly when the DIY grow light parts would've arrived.
The cheap grow light flickers at what seems to be 120Hz. Is there any info on what effects this has on plant growth?
The closest I could find is this study: Effect of Flashing Light on Plant Growth Rate. They flash it on the order of 5 seconds though, and not 60Hz/120Hz.