1. The lumen output of your OEM 921 bulbs will depend on the age of the bulbs, but typically a new 921 incandescent bulb will produce around 210 lumens. That number decreases steadily as the filament wears down through the lifespan of the bulb.@ Diode Dynamics
Your backup bulbs aren't allowed officially in Germany because they don't have any Europian test mark required by the EU laws.
Nevertheless I would like to order a pair to increase the intensity of the stock rear running lights.
Therefore my two questions:
1) Do you know the value of luminosity of the stock backup bulbs?
By that value I would have a better opportunity to decide, if I choose the bulbs with 210 or 410 lumens and especially to rate, if it's too easy to detect your bulbs on occasion of the mandatory general inspection in two and a half years.
2) Do you have any feedbacks by European or German customers about that whole matter?
Many thanks in advance for your answers.
2. We have had no reports from EU customers in regards to any of these concerns. If you are concerned about mandatory inspections, I recommend leaving your XV completely original.