The best replacement for g40 is g60.

The best alternatives to g40 are rated as following:
★★★★★  g60
★★★★  g50
★★★  g30
★★★  g25
★★  g50 bulbs
★★  g5.9
★  g50 bulb
★  g40
  g50 lights

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g40
g60
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