These salt lamp bulbs are for the new more waterproof versions occurred for TRCS 1 July 2020.
Cords bought from us prior (and without transformers) need a different bulb.
These are clear colour (although they look a bit yellow) and with screw base. ignore packaging dimensions below.
Do NOT use these in selenite lamps as it dries them out and they become brittle. Use LED lights instead that you can buy from Bunnings.
You do NOT need to buy a bulb if you buy a salt lamp from site as it comes with one. However many buy a spare bulb for “just in case”.