LED has fix spec. A 660 nm led is 660 +/- ?%
A 660 nm led cannot be white or blue.
A 660 nm have 6 to 10 bins. The bin is the +/- % . The tighter they +/- % the closer it is to the spectrum u define. And also more costly. The cost different can be up to 5 to 10 time different.
So you see the price you pay for the same spec of led can be a big different. This is the same for the your power supply and current driver. Till u able to compare apple to apple the price you pay for your led light set does not tell you anything