That’s because that dimmer doesn’t work with LED, and they have to give the disclaimer so they don’t have to buy it back! LOL! Must be some real old stock they had left over.
The inline dimmers for CFL's/LED's still work on incandescent/halogen. They just not normally rated for as much wattage as their older counterparts.I have two Casablanca fans that were installed when my home was built. They’re very nice, high-quality fans and I don’t want to replace them. They have halogen bulbs - the long, skinny ones similar to the ones used in portable utility lights. I’ve not found an LED replacement for these bulbs, so if I wanted a combination fan control/dimmer, I could use that device.
Like Hal said above re: existing equipment.