Dusk to Dawn light

We have a dozen Dusk to Dawn lights on our farm the type that clamp onto like an inch pipe. They have a 3-prong with photocell screwed into the top of them. They are all pretty old some are 175 watt mercury vapor and some are 150 watt high pressure sodium. Two of them are currently not working and I'm going to work on them tomorrow I'm thinking about starting to switch things over to LED. I am not looking for any type of a bulb retrofit, how to put a complete new unit up. Anybody on here work with any LED lights in the Dust to Dawn.

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Dusk to Dawn light