If you want to remain legal check this out.
http://www.ltsa.govt.nz/vehicles/get-your-lights-right.html
I tried the takata lamps and used a light meter to measure them against a standard lamp (I put one in and did back to back tests) the results...
The takata 5250K lamp output a massive 39% of the light of a normal lamp...
On road testing gave the same impression. I parked down the road from a lot of roadsigns and disconnected one lamp then the other and they definetly had a lot less range.
That being said the colour was a perfect match for my HID low beams which looked very good from the front of the car but probably wouldn't impress the cow you are about to hit cos you can't see it.
After this I did a lot of checking and finally decided that the Hella ultra's were the go.
They claim up to 50% more light but if you reasearch a bit then you will find that this is only for low beam. On high beam they only claim about 20%. The light meter says 23% better on my car (they are HB3's only high beam) but this seems better than that on the road and I put that down to the much tighter wound filament that gives a better focus for the majority of the light, also the colour is much better on the road than the standard lamps but nowhere near the blue colour of the HID's
If you read the link above you will find that HID conversions are illegal in this coutry which sucks. For me the best compromise was the Hella ultra's but if you were goiing for the look I would say the hella cool blue or blue vision, as they are changing the name to, would probably be your best bet even though hella only claims SIMILAR light output to standard lamps, if it were the same or better don't you think that they would say so?
Higher wattages are Illegal acording to the document but I doubt that you would get caught. I considered doing a stealth HID upgrade but if you do get caught out there goes a cool grand which is just a bit much of a risk.
Through general obsevation the narva version of the various lamps don't seem to be as good as the hella ones. I have no data to back it up but I tried both and stuck with the hella, I know several others who have done the same.
Since you are in dunedin I would reckomend going to TWL (opposite corner to the new bond&bond on the one way) As they had by far the best prices that I found, about half some other places.
Chris