I've really just noticed how poor my standard bulbs are in my 2005 Laguna!!
Don't worry, the standard bulbs on the Clio are pretty gutless too
Obviously Halfords sell 'Ultrabright' bulbs cheap but I guess they are cheap for a reason?
Halfords 'Superbrilliance' get a good writeup in AutoExpress - I fitted a set to the Clio and then took her for a spin around the lanes last night. Main beam is a huge improvement, and whilst high beam doesn't quite cause trees and small creatures to spontaneously combust it's fairly close
The 'quality' of light is very good for a filament bulb, very 'white' - it's almost, but not quite, on a par with the high-brightness LED lights (35W equivalent) I use for cycling - no idea how it the Halfords bulbs compare with HID or xenon bulbs though, as I have no personal experience of these.
The bulbs I purchased are safe for use with plastic lenses, although this may or may not be an issue with the Lag.
Also helps that Halfords have got a BOGOF on their own brand bulbs at the moment, meaning that the pair cost me 15 quid