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Am I right to assume you have to change the entire light unit to upgrade to the h7? I’m a bit of a newbie to all this!There are loads of threads on this subject, this one will have all you need: H4 To H7 Upgrade
I've just gone through this and went with some H7s bought off Facebook Marketplace for £70 plus some better bulbs and LED DRLs - all in £110. I'd say don't waste your money on new H4 bulbs as they will make very little difference and you will still be looking to upgrade. Invest the saving on some H7s or if you are feeling flush and want the looks go for a set of THQ lights for £500ish.