Honestly with any lighting you get what you pay for. If you don't have the money you are best off saving a bit and buying quality. Those Chinese lights are like a lottery whether you get a good set or not and as mentioned the adjustments are like a supercheap ratchet. It's either way to high or to low as the adjustments are massive between the teeth.
They also loose there colour and Lux pretty quick and sometimes one more then the other meaning you have 2 different coloured lights.
Cheers Mick