Honestly theres no need... As a few of us have said, this is what those type of lamp do at the end of their life, grab yourself a couple of replacements (size will be on bulb)
 
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Reactions: freddo
The arc tubes look to be blackening toward each end, a sign typical of end of life, as suggested by many posts on here.
 
I suspect that fitting in your pic may have water laying inside it.
 
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Reactions: SparkyChick
Is that an e27 thread ?if so you can get led lamps that will fit though it does involve bypassing control gear,an easy job,lamps expensive but less than new fittings & labour.
 
Had this issue years ago on a old mod building and it was caused by individual photocells in the fitting reacting to light from other fittings switching them off and on as each light heated up and changed lux levels. If possible try disconnecting photocells and see if lights stay on just do a couple as test and go from there
 
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Title
External Floodlights - Warehouse
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UK Electrical Forum
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Created
Owen,
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jdinduntocher,
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