Help me to create a neon light / cylindrical in shape

[sree.arun.kr]

Some one can help me to create a (neon/tube) light which is used under fall-ceiling(known as cove light).
In the below Image the blue light effect under ceiling.

In this image I used 17 blue lights. Then edited in photoshop to get the effect
But its so time consuming when it need changes in the scene, especially for rendering
& I think its doesnot look like realistic.
Thanks in advance. [O:)]

[Puybaret]

Sorry but in the current version lights can be only spherical...