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Here are some comparisions. I used the USA spec headlamp on low beam as the "control" setting. With the camera mounted on the tripod in an easily restored position, I set to f/5 in Aperture Priority. The camera returned a shutter speed of 0.125" at ISO 200. All other head-on shots were taken in Manual mode with these settings.

 
 
 

USA headlamp, H4 halogen bulb, low beam
Head on, USA headlamp, low beam

USA headlamp, H4 halogen bulb, high beam
Head on, USA headlamp, high beam

Euro headlamp, H7 halogen bulb, low beam
Head on, Euro headlamp, low beam

Euro headlamp, H3 halogen bulb, high beam
Head on, Euro headlamp, high beam

Euro headlamp, H7 HID, low beam
Head on, HIDs low beam

Euro headlamp, H3 HID, high beam
Head on, HID high beam

I used the same photographic technique for the wall photos with settings of f/5.6, 0.77", ISO 200.

USA headlamp, H4 halogen bulb, low beam
Head on, USA headlamp, low beam

USA headlamp, H4 halogen bulb, high beam
Head on, USA headlamp, high beam

Euro headlamp, H7 halogen bulb, low beam
Head on, Euro headlamp, low beam

Euro headlamp, H3 halogen bulb, high beam
Head on, Euro headlamp, high beam

Euro headlamp, H7 HID, low beam
Head on, HIDs low beam

Euro headlamp, H3 HID, high beam
Head on, HID high beam

Here is another comparison as the intensity progresses:
USA headlamp, low beamUSA headlamp, low beam
Euro headlamp, low beamEuro headlamp, low beam
HID, low beamHID, low beam
USA headlamp, high beamUSA headlamp, high beam
Euro headlamp, high beamEuro headlamp, high beam
HID headlamp, high beamUSA headlamp, HID beam

I also fired off a sample shot in Aperture Priority to see the auto-exposure difference from the USA headlamp to the HID-enhanced Euro. In the low beam setting, there was almost two full stops difference (four times the light intensity). In high beam, the difference is three stops (eight times). Now that is bright!

 
 
 
 
 
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