easily happens when time is passing and theyre constantly growing.
DIY is quite easy, but if you never did then i dont know.
problem with the amazon offerings is to know which diodes they really use.
if you dont want to diy, there is may some small growlight with good diodes and driver plus a dimmer, so you can underdrive it for your purpose.
But which one? Maybe this Board here https://todogrowled.com/en/hlg-quantum-boards/183-426-hlg-100-quantum-board.html#/28-target-full_cycle_enhanced_veg_phase_4000_k