In high ‘power’ cycle lights LEDs have pretty much completely replaced the HID lamps of 5 to 10 years ago. LED based lights are much cheaper, use less power (=better battery life), are smaller, lighter and more robust. What is more difficult however is to control the beam pattern properly as the LEDs ‘bulbs’ are not a small point source that can be easily focused. The majority of the mega lumen cycle lights are just LEDs mounted facing forward and throwing out a cone of light. For off road cycling this is fine as there are trees, overhanging branches etc that you need to see. For road use however they can be dazzling to other road users as there is no beam cut off. It is possible to design a (cycle) lamp unit that properly controls the beam pattern and has a horizontal cut off, the German StVZO regulation for cycle lights sold there demands it. Very few lights sold in the UK meet it though. To do so involves designing and building proper reflectors which costs development time and money. In cycling lights you can but Chinese lights that claim (probably incorrectly) to put out
5000 lumen for under £50. Compare that to a German compliant
80 lux light for £100. The big numbers sell despite the StVZO compliant unit probably putting more light where you actually need it (on the road).
With automotive lighting having much more regulatory control (than cycle lights) the car manufactures will have to do this reflector design work to be able to use LEDs, it’s not just a case of mounting an LED (or group of LEDs) in the existing reflector unit. Once the design work has been paid for I would expect (hope) that LED driving lights would become standard fit.
If VW are now offering LED driving lights it sounds like they have done this design work
. Do we know if this is for main and dipped beam?