3dDream said:There is a 70w led vs 70w hps thread on this site.
Boerman said:You have to figure in more than just the initial cost. If you are using HID lighting, you will need to replace the bulb once or twice a year. The LEDs will last for years. Then you have to figure in the cost of much more electricity. The LED/HID grow I am doing right now pits a 82w LED against a 400w HID. After 14 days, the LED is clearly ahead in both height and bushiness. So I am getting better growth with less than a quarter of the energy expenditure. Then you may also have to deal with heat issues brought about by the HID. Up front costs may indeed make it a bit iffy right now. But there is a tipping point where the total lighting costs (including electricity) for a year or two years leans in the direction of LEDs. I think we may already be there.
For those who would prefer to not deal with law inforcement, LEDs should be of particular interest. High power consumption is often a clue to the authorities that there may be a grow op inside. If you can cut your consumption by a quarter or even half, you will present a lower profile. Also, there have been reports of LEO using infrared sensing devices in helicopters and even in patrol cars to find unusually hot places that suggest an indoor grow. Lower heat may not be just good for the plants. It may give the grower better security.