There's a smart adjustable spring, which was designed for fast instaillation. Help to save lot of installation cost.
1. It can fit in all cut-out from 65-205mm (2.5''-8'') as recessed downlight,
2. It's also could used as surface-mounted light to be fixed on the ceiling or wall like a ceiliing light,
3. It's flicker free,
4. Build in driver,
5. Dimmable option