The difference between a single colour LED and an RGB LED can be explained in four main points:

1. Color Capability：
   • Single colour LED: As the name suggests, a single colour LED is designed to emit light of only one specific colour. This could be red, green, blue, or any other colour, but the key is that it's fixed and cannot be changed.
   • RGB LED: An RGB LED, on the other hand, integrates three different LEDs (red, green, and blue) into a single package. By varying the intensity of each colour, it can produce a wide range of colours, including white light. This colour mixing capability is the core difference between the two types of LEDs.
2. Application Scenarios：
   • Single colour LED: These LEDs are commonly used in applications where a consistent and specific colour output is required, such as in traffic lights, indicator lights, or for creating a particular ambient effect.
   • RGB LED: RGB LEDs are ideal for situations where colour changing or colour mixing effects are desired, like in stage lighting, decorative lighting, or for adding dynamic visual elements to displays and signage.
3. Control Complexity：
   • Single colour LED: Controlling a single colour LED is relatively simple as it typically involves just turning it on or off, and perhaps adjusting its brightness if it's a dimmable type.
   • RGB LED: Controlling an RGB LED is more complex because you need to independently control the brightness of each colour channel (red, green, and blue). This requires more sophisticated electronics and software to achieve the desired colour effects.
4. Cost Considerations：
   • Single colour LED: Generally speaking, single colour LEDs tend to be less expensive than RGB LEDs because of their simpler construction and control requirements.
   • RGB LED: RGB LEDs often come with a higher price tag due to their added functionality and the more advanced technology involved in their manufacture. However, this cost may be justified by the enhanced visual experiences and versatility they offer.

A single LED, by design, emits one fixed color and cannot change. However, RGB LEDs combine red, green, and blue into one unit, appearing to change color by varying each color's intensity. This creates a wide range of hues. Technically, it's three LEDs in one, but they are marketed and function as a single unit for color-changing effects.

LED strip lights can become dim due to several reasons. Here are four potential causes and corresponding steps to troubleshoot:

1. Power Supply Issues：
   • Ensure that the power supply for your LED strip lights is adequate. If the power supply is undersized or faulty, it may not provide enough current to the LEDs, resulting in dimmer light output.
   • Check the voltage and amperage ratings of your power supply against the requirements of your LED strip lights.
2. Incorrect Wiring：
   • Verify that the wiring connections are correct and secure. Loose or improperly connected wires can cause voltage drops, leading to dimmer lights.
   • Inspect the wiring for any damage or exposed wires that may be causing shorts or other issues.
3. LED Degradation：
   • Over time, LEDs can degrade due to heat, current fluctuations, or simply reaching the end of their lifespan. This degradation can manifest as dimmer light output.
   • If your LED strip lights have been in use for a considerable period, it may be time to replace them.
4. Environmental Factors：
   • LED performance can be affected by environmental conditions such as temperature and humidity. Extreme heat can cause LEDs to operate less efficiently, resulting in dimmer lights.
   • Ensure that your LED strip lights are installed in a well-ventilated area to dissipate heat properly.

Troubleshooting these potential causes should help you identify and resolve the issue of dim LED strip lights. If the problem persists after checking these factors, it may be necessary to consult a professional for further assistance.