Identify the sources of light from the list below and mark them with a checkmark.

Here are the sources of light marked with a checkmark ($\checkmark$):

• Fireplace with flames: $\boxed{\checkmark}$ (Flames produce light)
• Window: $\boxed{}$ (A window transmits or reflects light, it does not produce its own light)
• Side mirror of a car: $\boxed{}$ (A mirror reflects light, it does not produce its own light)
• Lit candle: $\boxed{\checkmark}$ (A lit candle produces light from its flame)
• Metal pot/kettle: $\boxed{}$ (This object reflects light, it does not produce its own light)
• High-visibility vest: $\boxed{}$ (This vest reflects light, it does not produce its own light)
• Headlights (or bright artificial light): $\boxed{\checkmark}$ (This object produces its own light)