Light change after render and model in a couple of parts.

[Komoreg121]

Hello!
I’m new here and already have two problems. I’ve made a street lamp model, UV map (so errors don’t show up), added point light which imitates lamp light. The problems are:

1. Before the lighting render, lamp looks like this:

But, after rendering it looks like this:

I’d like to save this “shine” effect. It looks cool. How can I do it?

Thanks for any reply or help.
Cheers!
(I hope you can see these images).