They put out more lumens but think of it this way if 60% of those lumens are in the wrong spectrum then that means its PAR value is around 40% of total light output and do not forget you need to factor in the distance those lights will be away from the plants so you have to apply inverse square law and when you do that you will find HIDs are worse on a watt for watt basis than a decent set of T5 or T8 tubes.