Theoretically, creating LED lamps with your own hands does not present any difficulties, you only need a power supply with the appropriate output voltage and the LEDs themselves. In practice, everything is somewhat more complicated.
Making LED lamps with your own hands for spot lighting the workplace or for table lighting is quite simple. To independently assemble LED street lighting lamps, that is, in common, this is already a more serious task. Street lighting should create a luminous flux of at least 1000 lumens, which will correspond to the equivalent of lighting a 100-watt incandescent lamp. At the same time, 200 lumens of the level of a light stream are enough for a table lamp .
To create an outdoor lamp, it is worth choosing LEDs of later designs that are easy to install, although not as effective as modern ones. Installation of LEDs should be carried out according to a pre-drawn diagram, which may be geometrically similar to a star or square. This will solve the issue of thermal cooling of the LEDs, evenly placing them on the board. Do not increase the supply current to increase their luminous flux. It is necessary to adhere to the operating mode that is indicated in the reference data for each specific type of such lamps.
LEDs of the MX-6 and XP-E type are designed for direct current in the range of 300-350 mA, therefore, their connection diagram must be calculated based on these indicators. When designing LED lamps with your own hands, you need to adhere to the specified voltage and current indicators to get street LED lamps with high reliability and safety. To increase the thermal dissipation area of the LED street lighting lamp, an additional radiator is installed on the assembled LED board module, which allows the use of several such modules operating in an economical mode in one housing of the illuminator.
Now, regarding the power source. For a conventional LED table lamp, you can use an adapter whose output voltage is regulated by a diode, and the output current is set by a resistor. Such a power supply unit is not suitable for a more serious lighting device, since during operation the diode heats up and changes its characteristics, which can lead to failure of the entire lamp.
Do-it-yourself LED lamps are good because they allow you to calculate the power consumption and apply as many LEDs as there is an appropriate adapter with output current stabilization. For example, for a module of 3 LEDs, a 5-watt adapter, such as the LC3536-08, is sufficient.
For spotlighting the desktop, lenses can be built into the LED lighting source that will focus the light flux at a given point, for example, such as LL01CR-DF60L-M2.
As you can see, it is possible to "sculpt" light structures from LEDs and successfully use them for lighting in the house and on the street.