hello, at ebay there are indeed these universaen LED daytime running light to afford. Some costs 20€ andre again 70€ or 100€. What do I have to consider here for registration and so on? Many mainly cheaper have an E-test mark but may not be used as daytime driving light. How then? as additional headlights? Predominantly have R87 approval i.e. they should usually be used as Tgfl. or? so they may light up as soon as engine ignition is on and must have Erlische sobal d you turn on the dipped-beam. Who can explain this briefly and simply?