Which color LitePipe should I use? This is a very common question, and the answer has several considerations. When choosing a color, one should consider the following: contrast with the color of the target or of the surroundings; color blindness; desired intensity; and of course, personal preference. Which HIVIZ LitePipe can be seen the best? The human eye is most sensitive to the green LitePipe. Green will be the most visible in all light conditions, followed by orange and then red.