MARS HYDRO TS 3000 LED Grow Light Bulb Full Spectrum Dimmable for Indoor Plants. Four have only one grow cycle of use, one has just two grow cycle of use. Do your own research as I'm not responding to spec questions. They are very highly rated units in comparison tests. You can go to ebay search in descriptions for more details. I paid $239.00 for each one. They work PERFECTLY.. Like new condition. Four come in original boxes. $300.00 for all 5 FIRM! CASH ONLY. Thanks