Dimmable lighting assists in unlocking enhanced energy savings. It also gives users more comfort as well as control. There are new dimming requirements for all DCL products. Dimming is a requirement for both DLC V5.1 and V5.0. However, there are slight differences. For instance, in V5.1, the new dimming policy requires almost all the products to show dimmable capability. Dimming capability is needed for most products on the QPL.

https://www.ledlightexpert.com/dlc-5-1-listed-lighting