Right now, I'm using a hodge podge of T4, T5 and T8 tubes in my high tech 4' and was wondering whether the Chihiros A1201 or Beamswork 800 would produce at least an improvement in lighting at substrate level which was measured to be around 17". The reason I'm thinking of changing lights is because my tubes are mounted on reflectors and sitting on the tank itself which contributes to heating problems and on hot days, my water temperature goes into the low 30s which can't be good for everything inside the tank.