Converting garden lamp post to solar

I've got a tall (8ft) colonial style lamp post which is current powered by 240V. We leave it on in the evening for visitors; however often leave it on by mistake over night - and don't realise until the morning.

I'm thinking about adding a solar light to the lamp post (in addition to the 240V globe), so it comes on for a few hours when the sun goes down. I was planning on getting a solar garden type spot-light or similar (something high power) from bunnings, removing the housing and placing the solar panel on top of the lamp post and installing the globe in the lamp. Has anyone tried anything similar and if so any recommendations on suitable lamps/parts. Purchasing the parts separately (solar panel, etc), seems much more expensive and difficult than using the parts from garden lamp or similar.


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