The VIVISUN 99 and 95 series are legacy switches which both use incandescent bulbs instead of the current LED's that are used in our newer model.
The 95 series can contain NEXSYS Component Technology, and since the switch body and caps are separate pieces, they can easily be upgraded with LED caps.
Upgrades to LED lighting should be made to all units on a panel and mixing LED and incandescent lighting on the same panel is not recommended. Some minor lighting difference is typical but the color, appearance and brightness are very similar. The LED responds with a uniform voltage dimming curve matching typical incandescent performance. In certain applications the LED may exhibit higher brightness levels at full rated voltage than older incandescent lamps.