Hi agn ,more or less right you don't have to bond to light as it should be sealed from access if suitable for bathroom.
17th edition regs due next year don't require bonding at all! but all circuits in bathroom including lights will have to be on rcd. at the moment its as I said, bond exposed metal work together inroom or central point nearby, and also connect to any other leckie powered equip. in room, except light,
ie towel rail at spur box etc
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