Ok so I will be building a new rack soon and plan on using 12" sections of the 11" flexwatt. However, I also want to make a couple of the shelves with the 3" 10 watt flexwatt but I know your supposed to use the same wattage flexwatt so that the heat being release is equivalent. My 12" sections are 20 watts each and the 3" section is only 10 watts per foot, if I were to get a 24" section would it work out the same. Not sure if it works this way?????

1' of 3" FW = 10 watts so two feet should = 20 watts. Correct????