In a kitchen, is there a "rule of thumb" about the length of under cabinet lights per cabinet and the number of light bulbs needed in each unit? I want the lighting to dispel any shadowy spots so better task lighting and to keep on low overnight. Each cabinet along the wall is 24 inches wide. There is a corner cabinet with the cabinet on the other side also 24 inches. We will have direct wire and link the units together. They will be on a dimmer switch and I plan on warm white.. I am looking at one light unit that has 4 bulbs for 4.0000 maximum wattage. Thank you for any help/advice on how to decide this, especially not having dealt with LED before.