I am currently refitting a kitchen which measures 3.4 x 2.5 metres (11' x 8'6'), which is currently lit by a 1.5 m (5') long fluorescent strip light. The wife wants to dispense with the strip light and install a more stylish looking set of 4 spot lights, but does not want a darker kitchen. How many conventional incandescent light bulbs or halogen or tungsten spot lights would I need to match the fluorescent light output?