The best replacement for r40 is br40.


The best alternatives to r40 are rated as following:
★★★★★  br40
★★★★  par38
★★★  r30
★★★  r50 insulation
★★  r50
★★  br30
★  r38
★  r30 bulb
★  r42
★  r20
★  r144
★  t30
  hf r400
  r400

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r40
br40
par38