Hi
@indacouch! A lamp pulling 615 watts from the wall is a 615 watts lamp, no "equivalent" or "efficiency" here, only raw wattage matters, everything else is a lie. You should look for "QuantumBoards", these panels rely on Samsung mid power LED (lm561c or even better lm301b) which are the new big thing in the growing industry. These are probably the most effective grow lights onto the market nowadays. Growers with good coverage usually get more than 1g/w. The drivers are dimmable, so you can control your light power (and your electricity bill). They're usually dimmed at 25-50% during veg stage and 75-100% during flowering stage, depending on the driver's power capacity and the size of the board(s). If you cannot afford the official QuantumBoard from HLG, you can try to go DIY, many companies are selling the same boards they use at HLG. I got my boards from "InvisibleSunLed". Hope this will help, keep us up-to-date and happy growing 👊