Just recently my ceiling lamp in rented apartment died. I'm not sure how to replace it since it looks like led strips not a light bulb inside it .
Photo : https://ibb.co/0sWBgSc
Anyone know how to replace it and where can I buy those replacement in sydney ?
You can't, you'll need a new fitting which isn't a tenant's responsibility. Contact your rental agent who will organise a replacement with the owner.