Previously when you prepared food in my mom's kitchen you would be standing between the ceiling light and your work surface, thus casting a shadow. Additionally, under cabinet lighting tends to look nice. It's quite the dramatic effect in person and definitely stepped up the look of the kitchen a lot. It's less harsh of a light in person and significantly improved visibility while working in the kitchen.
Cost & Power Usage
I was able to light my mom's entire kitchen for under $40.00 including all parts. Additionally, the lights are quite power efficient, using about 3 watts per light tube (I used 6 pair / 12 tubes total). Total wattage=36 watts, or 3amps at 12V. This is a little over half the power usage of a normal 60watt incandescent bulb. Your final project price will vary depending on your supplies and the size of your kitchen.
Compare With and Without
1. Under cabinet lighting on, Ceiling light off.
2. Under cabinet lighting off, Ceiling light on.
3. Both under cabinet lighting on and ceiling light on.