Unfortunately we don't get Nightguide's over here so you'd have to buy them off ebay if you wanted them. They are standard wattage though. Check out Philips Essential Vision bulbs now that you have the upgraded wiring. They're 100/90w in the H4's while Osram Rallye H4's are only 70/65w. Plus you can get them from any auto store.
You'll definitely notice the difference then ;)