The best replacement for 7440 is 7440a.

The best alternatives to 7440 are rated as following:
★★★★★  7440a
★★★★★  7443 bulb
★★★★★  7443
★★★  3157
★★  921
★★  7240
★  wy21w
★  3156

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7440
7440a
7443 bulb