Light output is measured in lumens, or candlepower. Watts is an electrical unit. The fluorescent household lights put out a lot more light per watt, but this technology isn't in use in H4 bulbs.
My impression of the "halogen" technology was that a halogen bulb was good for maybe 10% or so more light per watt. I wonder what technology gives 50% more light output.
I'm assuming these new H4's still use a tungsten filament... can a different filament design or some special gas inside the lamp make a 50% difference?
I don't know...
Lehigh Valley PA USA
73 Olds 88, 72 MB 280SE, 78 Datsun 280Z, 71 T-Bird, 72 Olds 88, 83 Nissan Sentra, 85 Sentra, 73 230.6, 91 Integra, 83 300SD, 91 Volvo 940GLE wagon, 84 300SD, 95 Subaru Legacy L wagon, 02 Mountaineer, 91 300TE, 08 Murano, 2007 R320CDI 4Matic 52K, some Hyundai, 2008 BMW 535xi wagon all gone... currently
2007 Honda Odyssey Touring, 2011 Honda Odyssey Touring