Lucky bag with different LED types

This bag contains standard-LEDs of different colours and form. All LEDs run with a current of 10 mA or less. Each LED has to be set into operation by using a series resistor, which limits-according to the operating voltage- the current to 10 mA or less. The LEDs can only be used with direct voltage.
The LEDs have different operating voltages, according to their colour.

Equipment
• Red approx. 1.6 V
• Green approx. 2.1 V
• Yellow approx. 1.8 V
• Infrared approx. 1 V (invisible light for humans, for infrared remote control)