Welcome to the Bunnings Workshop community. We're pleased to have you join us and look forward to reading all about your projects and plans for around the house and garden.
I would imagine our helpful community members need a lot more information about your light before they can assist. Could you perhaps provide a photo of the light and/or the globe you are trying to replace?
Please let me know if you ever need a hand getting the most from the Workshop site.
It sounds like you are after a Philips 58W Cool White TL-D T8 Fluorescent Tube. It's 1.5m instead of the more common 1.2m varieties. It's always a good idea to replace the starter at the same time as it could be the reason why the light isn't working. The globe and starter are available at Bunnings Ashfield, and you'll need to place a Click & Collect order for it. The team will have it ready for you as soon as possible.