On Sun, 4 Mar 2018 09:27:15 -0800 (PST)
wrote:

Hi All,

I have a couple of lamps Id like to upgrade to LED, but am unsure
what bulbs to buy...,,

First is a Coleman camping light that has 4AAs arranged 2 in // in
series with 2 in // such that I presume they provide 3V at the bulb.
The previous bulb was a push in type as commonly found in bike lamps.



The other is a 3 x D Cell Maglite. (Cant remember offhand what sort
of bulb this takes). Id rather go for something that will just plug
in and work rather than converting an existing bulb (if that is
possible).

Can anyone give me links to suitable bulbs on eBay / Amazon /
wherever (prefer to buy single bulbs rather than 10 off)

Searching
3v bulb replacement led
gives plenty of results on eBay and Amazon.
I got some 6V ones for a dynamo years back and never got around to
using them, so I can't say how good they are (still using halogen).
But I just got another dynamo for a different bike, so might give them
a go soon.