To make DIY grow lights for indoor plants, use LED strip lights or bulbs with a balanced spectrum. Attach them to fixtures lined with reflective material for efficiency. Connect the LEDs to a power source, ensuring a secure wiring setup. Mount the fixtures with adjustable height options using chains or brackets. Optionally, use a timer for automated light schedules. Regularly monitor and adjust the lighting to meet the specific needs of your plants. Prioritize safety and consider commercial options if uncomfortable with electrical work.