Consider updating light delivery systems. Modern tubes are smaller but actually generate more light due to improvements in phosphor chemistry. Suitable Lighting Compact fluorescent bulbs are great for some locations, and have problems in other places. The lives of all bulbs, including CFs, are shortened by lots of switching on and off. CFs are likely to fail prematurely in places where the electricity is junky, for instance on unconditioned generator-powered systems.
CFs sometimes have trouble starting when it's cold or the electricity is weak.
Be sure the larger compact fluorescent fixtures fit inside the cover. On multiple bulb fixtures, you can often increase the amount of light dramatically while decreasing the cost of electricity. Waste heat is not the problem it was with the original bulbs. A classical task, and an invitation to use task lighting. Here's where to use those sexy little low-voltage halogen lights.