SAD lamps are used to treat Seasonal Affective Disorder. SAD lamps are a part of light therapy and have been used to treat SAD for more than 20 years.
decorative
It is just for decoration
we still use the Widow's Lamp to comemorate the momory of the race accoring
It is just for decoration
what the function of lamp holder
It depends what kind of lamp it is. It's either to provide heat or light - or both !
A backup lamp on a vehicle is there to see what is behind it. Another type would be a extra lamp ready to use if the main lamp fails.
It is just for decoration
To control the burn rate
to show God was the Eternal light.
because somebody didn't answer
To improve management decision-making.