[LONGHAIR]

That lower wattage rating is just showing you the increased efficiency of the Halogen bulbs. They use less power to make light.
To be fair, you need to know the lumen out-put, not the power draw.
What you are really looking for is "how much light" you get.

Those lower wattage bulbs should be brighter and whiter than the originals.
The relays are the way to go though, in either case.