Night Sky Model

Now that white LEDs are available at reasonable prices, one nice application is an imitation of the night sky. The LEDs emit a rather cold bluish light (6500 to 8000 Kelvin), which gives a good ‘star’ effect. The magnitudes (relative brightnesses) can be reproduced quite well by using different values of series resistors.There are various ways to build such a model. The simplest is to use a piece of black cardboard, with holes for the LEDs punched in the proper locations.