you need 6700k for veg and 2700k for flower. but a mixture of both is recommended. you can buy CFLs at any store. Make sure you get ones with a high wattage (dont mind the equivalent wattage, just the true wattage).
also just so you know "kush" doesnt exactly mean its a high quality strain, its all dependent on genes. you can have a kush strain with crap genes...