LED lamp for physics class

### LED lamp for physics class ### Optical experiments can particularly excite students in physics lessons, especially if you have enough colorful lamps! You only need three printed parts and a few components for this lamp. The structure is simple. If you are lucky, you will find a skillful student to help you assemble. The lamp requires • three printed parts (bottom part, top part, slits), • a switch of the typ Wentronic S 103 (see pdf), • two self-tapping screws DIN 7961 2.2x6.5 (for the switch), • two pairs of battery springs (with 10mm width and 9mm height as well as a small, 7mm long soldering tag) • four self-tapping screws DIN 7961 2.2x9.5 (for the connection of bottom part and top part), • two AA batteries, • a small piece of wire and • of course a LED in different colors. The bottom part is the same for all lamps. All components are assembled in this. The photos should be meaningful enough. I printed the lamp in the color of the LED (at least something like that). The wavelength of the LED was also specified in nanometers on the upper part. (If you need labels with other wavelengths, please write me a comment. I would like to do ad this.) An upper part without labeling was created for white LEDs. I created three types of slits: with a width of 0.2mm and of 0.5mm and one with a 5mm hole And I used a lot of LEDs !

Colour	white	violet	blue	bluegreen	green	yellow	yellow-orange	red	red-orange
wavelenght	-	400nm	466nm	500nm	520nm	592nm	611nm	623nm	630nm
current	30mA	25mA	35mA	25mA	25mA	25mA	20mA	20mA	20mA
voltage	5V	3.5V	4V	3.2V	3.2V	2V	2.2V	1.94V	2.2V
resistor	-	-	-	-	20 Ω	20 Ω	20 Ω	20 Ω	20 Ω

The specification of the wavelength for the red and the red-orange LEDs corresponds to what the supplier (reichelt.de) specifies. I have not experimentally verified this information.