LED lamp for physics class

thingiverse

<b>Students in physics classes can be particularly excited about optical experiments, especially if they have access to colorful lamps!</b> To build this lamp, you'll need three printed parts and a few components. The structure is simple, and if you're lucky, you might find a skilled student who can help with assembly. Here are the materials needed: • Three printed parts (bottom part, top part, slits) • A switch from 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, and a small 7mm long soldering tag • Four self-tapping screws DIN 7961 2.2x9.5 for connecting the bottom part and top part • Two AA batteries • A small piece of wire • Of course, a LED in different colors The bottom part is the same for all lamps, and all components are assembled in this part. The photos should be clear enough. I printed the lamp in the color of the LED (at least that's what I intended). The wavelength of the LED was specified in nanometers on the upper part. If you need labels with other wavelengths, please let me know, and I'll add them. An upper part without labeling was created for white LEDs. I made three types of slits: one with a width of 0.2mm, another with a width of 0.5mm, and the third with a 5mm hole. And, I used a lot of LEDs! <table border="3" frame="void"> <tr> <th>Color</th> <th>White</th> <th>Violet</th> <th>Blue</th> <th>Blue-Green</th> <th>Green</th> <th>Yellow</th> <th>Yellow-Orange</th> <th>Red</th> <th>Red-Orange</th> </tr> <tr> <td>Wavelength</td> <td>-</td> <td>400nm</td> <td>466nm</td> <td>500nm</td> <td>520nm</td> <td>592nm</td> <td>611nm</td> <td>623nm</td> <td>630nm</td> </tr> <tr> <td>Current</td> <td>30mA</td> <td>25mA</td> <td>35mA</td> <td>25mA</td> <td>25mA</td> <td>25mA</td> <td>20mA</td> <td>20mA</td> <td>20mA</td> </tr> <tr> <td>Voltage</td> <td>5V</td> <td>3.5V</td> <td>4V</td> <td>3.2V</td> <td>3.2V</td> <td>2V</td> <td>2.2V</td> <td>1.94V</td> <td>2.2V</td> </tr> <tr> <td>Resistor</td> <td>-</td> <td>-</td> <td>-</td> <td>-</td> <td>20 Ω</td> <td>20 Ω</td> <td>20 Ω</td> <td>20 Ω</td> <td>20 Ω</td> </tr> </table> The specification of the wavelength for the red and red-orange LEDs corresponds to what the supplier (reichelt.de) specifies. I have not experimentally verified this information.