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Yes, I know this has been discussed before.
I'm relaying my headlamps and looking at the current standard two relay setup main and dipped will be on at the same time when main is selected.
To me that seems like a lot of power (60+55W so 115W) and heat for a standard H4 bulb to take. I'm concerned that my plastic headlamp bowl will melt during long duration's of high beam being used, which I expect it will be during the RBRR next year and drives on the continent.
Looking at the internet a lot of cars dipped beams extinguish when main is being used, apart form when you flash dipped and mains.
Thoughts please.
Why would you have dip and main on at the same time? If you have 2 relays, 1 for dip and one for main and use the dipswitch outputs as switching wires to the relays (This is kindergarten stuff, I know) then when you select main beam, the main beam filament of the outer bulb is energized and the dip filament drops out as the dip lead out of the dipswitch is no longer live so no switching feed to relay. Sure you CAN get both on at once, if you have the headlamps on dip and pull the "flash" switch - but that is only momentary and no big deal! At least, it's ok if you have relays and aren't melting the dipswitch!
For electrical purposes you can treat a twin filament bulb as 2 separate lamps.
Steve