SMDs are more efficient than COBs because the light source produces higher lumens per watt, which means that they produce more light with a lower wattage. They produce a wider beam of light which is spread over a greater area. This means that less material is needed for the heat sink, which in turn means that they are more economical. The manufacturing procedure to make them is more expensive as the SMD diodes (LED chips) are machine printed on a PCB board. Most domestic downlights use SMD LED. SMD downlights are covered with a frosted reflector which hides the LED chip array and spreads the light evenly. SMD downlights produce a wide spread of light. It floods light everywhere which in turn means there is a higher glare. Their wide beam angle means they are suitable for larger rooms like living rooms, bedrooms, kitchens and bathrooms.