I think it depends on the led, there are led's out there from $200 to $2000. I had a buddy tell me his switch from halides to Led's was a disaster, he was using a cheap homemade unit. I switched from halides to the Radium Pro's and could not be happier. Growth is as good as halides if not better, color is much better and tank runs much cooler, all that plus much more control allows me different lighting schedules and to have different lighting throughout the day.