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Im in process of building and priming my nids, im going for theme from alien, i need some help in trying to make the real bright illuminous green for parts

A spot of royal blue with a fair chunk of lemon yellow makes a lime greeny colour, failing that, perhaps actual flourescent paints? Daler Rowney make some, I think Liquitex do too.

Gw do Moot Green, which is quite bright, but their older version 'bilous green' was much brighter

Vallejo Game Colour have a colour called Livery Green. it's really bright. A bilious green equivalent.
Glaze that with Snot Green from GW or similar equivalent and you'll be gold.
Oh yeah, the livery green is pretty thin so shake it really well and paint it over a white base/undercoat.

Thanks something for me to look into and try

might be over kill but you could try dayglow pigments.

http://forgedmonkey.com/products-page/hobby-supplies/dayglow-pigment-acid-gree/

the guys over at massive voodoo have used dayglow pigment to great effect and it give a really great luminous effect, but again may be a bit over kill for what you want.

article about them here for you

http://massivevoodoo.blogspot.co.uk/2011/10/tutorial-using-dayglow-colors.html

Looking at that article there abit to bright for what im after but a good option for other things, thanks

Yellow with a green glaze could do the trick.