You can try reducing the supply voltage, they will usually function below the 5V rating. What you’ll find is that once you get below about 3.5V, the colors will start to shift, since the blue die needs the highest voltage (around 3.2V), then the green (around 2.8V), while the red will happily work down to far less. The consequence is that blue will go dim sooner than green, and that sooner than red, resulting in a progressive color shift, first towards yellow, then towards red.