vivosun 1-pack 1000 watt high pressure sodium hps grow light bulb lamp - high par enhanced red and orange spectrums cct 2100k, ultra bright 140,000 lumens vivosun <b>vivosun: the #1 choice for indoor grow </b> <br> <br> vivosun focuses on designing and manufacturing quality grow lamps that <br> produce supplemental or artificial light for indoor plant growth. <br> the most reliable grow lamp on the market - 1 million+ happy users and counting <br> <br> <br> <b>tips: </b> <br> <br> please be aware that grow light bulb is a consumable product. regardless of hps, mh, led, <br>fluorescent or the incandescent light bulb, the fact that the total lumen (brightness) will <br>decrease in time. for an optimized growing condition, it is strongly recommended to <br> change your grow light bulb after 12 months of continuous use. <br> <b>note: </b> <br> the trigger voltage of our ballast is 7000v, and output frequency is 100k.<br> if your ballast cannot reach the standard, then our bulb cannot be lighted up.<br>