Excellent Idea!  I have tried to get Derbyshire County Council interested in using this method of replacement before with a similar product to this, but they seem "hellbent" on replacement with brand new units.

Shame also to see that they are available in 4000K and 5000K option instead of just 3000K to force councils to use only Warm White (Which we all know is best all-round!)

As LEDs have developed, the use of small lenses to focus the beam, rather than the use of a reflector behind the light source (as with SON) lanterns, has now become universal practice.

This modern bollard light spotted in the roof garden of the new Canary Wharf CrossRail station shows how LEDs integrated with lenses can be used to tightly control the beam to light a pathway.

Rise of LEDs in USA has created a graveyard of discharge lanterns (Retweeted by @UKASTLE)

That's actually London Borough of Wandsworth!

Sorry I did see Wandsworth but assumed it was a USA equivalent... without my glasses on they looked like discarded cobras!! doh!

Not the best example of an LED retrofit... (Retweeted by @UKASTLE)