Why do my HPL lamps seem to go ka-pow after about the third time I switch them on on a hot circuit, or after I leave them on for 3 or 4 days?
Because you are probably using the 115v HPL in a constant / full voltage situation, and you need to use the 120v HPL for that. Save your 115v HPL lamps for the stage.
Is there a difference between an E26 and an E27 type lamp base?
Although E26 and E27 base lamps are commonly used interchangeably in the field, there are subtle differences:
- Lamps with E26 bases can be UL/ETL Listed in the US and Canada. E27 cannot be Listed.
- E27 bases are rated for up to 220V; E26 bases for up to 120V.
- The E27 base is 27mm in diameter; the E26 is 26mm.
- The E27 screw base is about 1 mm longer than the E26 base and will not entirely seat in an E26 socket.
- An E26 may not always fit 100% properly in an E27 socket and vice versa.