They are very good, the price kinda sucks tho, especially since they are cheap to make. cheaper than an HID to manufacture.

The LEDs produce only the colors of light in the spectrum that the plants needs , NASA has been doing research on the effects of this and has had great results. i belkieve 1 light bar is = to a 250 Watt HID.

Very low heat generation
â?¢ No ballast required
â?¢ No reflectors
â?¢ Targeted light output
â?¢ High shock/vibration resistance
â?¢ Some companys offer a warranty
â?¢ Typical LED lifetime of 100,000 hours
â?¢ Power consumption less than 6 Watts as compared to 100 to 1,000 Watts conventional grow lights consume. On average, you use 33-times less energy with our LED-PLANTBARs
â?¢ Lower voltage (after passing through power supply
â?¢ Lower burn and fire risk

Kit of 1 LED-PLANTBAR with Power Supply is $159.95