Don't worry about the watts bigger the fixture higher the wattage. You can go with the 24 in the particular fixture I'm sending you recommendation for comes with the bulb once you're on the site you pick the bulb I would go 12% this bulb you make sure they have access 12 to 18 inches like 15 is perfect. This is Arcadia brand but any high-output 10.0 T5 would work
Don't worry about the watts bigger the fixture higher the wattage. You can go with the 24 in the particular fixture I'm sending you recommendation for comes with the bulb once you're on the site you pick the bulb I would go 12% this bulb you make sure they have access 12 to 18 inches like 15 is perfect. This is Arcadia brand but any high-output 10.0 T5 would work