Growing lights..

Hello im a new grower and acccidently bought $379 worth of yeatek white 6 peice 1800 watt cob lights...i thought they were full spectrum colours but they only emmit white light. Did i just waste my money because white light doesnt provide full spectrum?

 

Buying more blue/ red lights to supplament the wavelengths woyldnt be a bad idea though right

 

Im growing 4 plants

 

Its spectrum is 380nm to 780nm

 

I heard its bad because its mostly red light and no blue light