But it shouldn't matter how much I pay for kWh. Cause I'd still save using LED right? I dont care about cost of LED lights. I just have never used LED. Figure keep HPS for flower cause I have always heard you get less yeild on LED. So figure maybe just LED for veg.
Matters a ton. LEDs pay for themselves quickly if your power cost is $.35/kwh. Not so fast if its .075/kwh, which I pay.
Some thoughts:
1) Yield is directly proportional to photons received by the plant. If you deliver equal light strength of equal spectrum, you'll get equal yield.
2) Purchase price for LEDs is still quite a bit higher for a given light strength than HID. These costs are offset by the power savings for the light themselves, as well as cooling, because LEDs put off like 20% of the heat that HIDs do. Whether this offset is signifcant depends highly on your cost for electric. At 8 cents a kwh, may not be worth it to you. LEDs are about 40% more efficient than HID. Watch the video in the first post for detail on this.
3) LED solutions offer more configuration of spectrum than HIDs. Doesn't matter to you, if you've already got a setup you like, but for greenfield installs, its fun.