The OEM light valve of SEROW250 ran out of bulbs, so I installed it. I ran out after just under 60,000km, so I'm happy to replace it when it gets over 50,000km.
Compared to the OEM, it's about three times brighter and a little more white-colored. It is recommended as a Halogen bulb because of the perfect quantity and quality of light, but if you are aiming for more light quantity, it is not enough. I don't know how durable they are yet, but I expect them to last as long as the OEMs.