I don't understand the difference between capital works and capital allowances. As I said, the items are light fixtures, ceiling fans etc.
Onion, Capital Works means structural stuff i.e. the building itself. So that is the roof, walls, windows, doors, wiring, plumbing, ducting, tiling, dunny, kitchen cupboards, benches etc etc. It's anything that that will last a long time. Capital works are claimed at 2.5%pa.
Capital Allowances refers to the Assets i.e. things that won't last as long as the building itself. These include: kitchen appliances, air con units, ceiling fans, blinds/curtains, carpet, floating floor, hot water units, exhaust fans etc. This stuff can be depreciated more quickly because it wears out more quickly.
The under $300 thing does not apply to Capital Works, just to Assets.
If you are installing Assets like blinds and ceiling fans and they are costing under $300, your accountant will write them off immediately.
Light fittings are tricky. If they are hard wired, and especially if they are recessed, the ATO regard them as part of the building i.e. Cap Works. If you are only putting in a few of them, your accountant may slide them through as Assets, too.