there is really no difference in light output... they are just designed for different applications. A H3 bulb puts out enough light to effectively light up the road at night... but usually the projectors that they go into are not designed properly... which is why you get crappy output and short bulb life. H1 bulbs can usually be found in high beam applications and alot of emergency lighting. You'll probably get better output with the H1 projectors though... they tend to be designed better and produce better light. If the projectors end up being terrible you can always open the headlights and swap the projectors for some OEM H1 or H7 projectors if you want to stay halogen, or use HID projectors with a HID setup and light up the night! When I say OEM projectors, i mean (for example) from volkswagen headlights (which do use H1 projectors).