This listing is for 4 of the 2700K strips and 2 of the 6500k strips. The 2700 is recommended for the flowering stage. The 6500 is recommended for the vegetative stage. If you mix these together 4 of the 2700 and 2 of the 6500 like this, you end up with a great mix reaching more of the red and blue spectrum than you can with any single color.The above driver is just one way to go. There are other configurations that will work, too and several resources out there to know which ones. If you don't know any, just ask and I can point you to one or two great ones or I will answer any questions you have. Check out my other listings for separate strips, boards, red booster strips, heatsinks, etc. Or if you want a certain quantity or configuration, just let me know. The item "576pcs Samsung lm561c S6 with heatsink 250W Sun Board LED NOT Quantum Board" is in sale since Saturday, May 11, 2019. This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Gardening Supplies\Hydroponics & Seed Starting\Grow Light Kits". The seller is "ucandewit" and is located in Erwin, Tennessee. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Colombia, Costa rica, Dominican republic, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica, Aruba, Ecuador, Guadeloupe, Iceland, Luxembourg, Maldives, Oman, Peru, Pakistan, Paraguay, Reunion, Viet nam, Uruguay.