For any switch to work there must be a neutral (or “return path”)
- Neutral requiring dimmers use the neutral wire to complete the dimmer controller section
- Non-Neutral dimmers use the load as a path to neutral
Older non-Neutral dimmers required too much current to power their internal circuitry the ultra low power LED lights would actually turn on dimly with the current the dimmer needed to function.
Newer dimmers (like the Red) consume much less current to operate so a low powered LED is often enough to operate the dimmer control circuit. Note some LED’s require so little power that an additional load is required the operate the dimmer. This load is in the form of Non Neutral bypass
If the neutral is available I would definitely use it… My logic is that down the road a replacement LED may not be able to power the dimmer circuit and the lights could flicker.