I've two GE 4510 6.4V 25W tractor bulbs with me. Unfortunately, the only power supply I've in my possession is capable of outputting only 12.02V. Can I connect the two lamps in series to the 12V supply? I'm slightly confused because most of the posts on internet that mention about bulbs in series connection have same or higher voltage than the power supply. Thanks everyone. Cheers!!
As Mike has said this will work.
However depending on what you plan to use these lights for be aware that failure of either bulb is likely to leave you with no light and quite possibly with two blown bulbs.
If a bulb fails open-circuit then both bulbs will be off until the failed bulb is replaced.
If a bulb fails with a brief short-circuit then the other bulb will see the full power supply voltage. This may well blow the good bulb as well.