after 10 yrs I've finally gotten mad our hallway lighting and want tot sort it out. any advice v welcome: 2 ceiling light points(?). One has a pendent handing down the 4 bulbs encased in thick frosted glass balls, and the other has a double spot light. They r on the same loop with 2 light switches working both light point together. Each light point can only have 1 bulb in at a time. If I try more they burn out in a day or 2. I've tried 40 & 60 watts. Shoot! Pls