I was bored again, and was also itching to try out the "sensors multitool" app where it uses the phone's sensor to measure lux. I tested the halogen bulbs I have in my garage with the only lightsource from the car (headlights + position/signal lights). The bulb is about 7 ft. from the wall. There's a white wash basin (laundry sink type thing) beside the driver's side hotspot so light might be reflected/concentrated. That might be why the drivers' side is brighter... that or I have weird headlights as I mentioned before. The bulbs I tested are the stock Osram bulbs that came with the car, Philips H9 used for 2 weeks, and Osram Night Breaker Unlimiteds, both brand new, and 2 years old. Not sure how accurate the sensor is, but it's all tested from the same spot and location, time stamped too!