![]() The cost of small parts to a manufacturer is an inverse function of quantity because the distribution cost of packaging and shipping 1,000 small parts or a 20,000 is about the same. With manufacturing, the number of units produced and sold is more important than list prices for individual parts. Again less voltage means less number of batteries. So putting GREEN LEDs in series will require more voltage than the same number of RED LEDs. In the same pdf article you can see that the "knee" voltage of the RED LED is lower than that of the GREEN LED (figure 10). BLUE was not as it is too dark.ģ) Electrical Engineering - the good stuff. I think it would be hard to make out the numbers as the green light may be too bright. Imagine at night looking at a clock with green LEDs from a distance. So in fact if you look at two LEDs one red and one green of the same power rating, you would notice that the green is much much brighter than the red and even to the point where the eyes get a bit sore/sensitivefrom looking at it. The pdf article from MAXIM shows that the eye is most sensitive to green LEDs (figure 2). I went to and searched for prices on RED and GREEN LEDs (just the normal type ones) and I noticed that the GREEN LEDs are more expensive than the RED LEDs (more than 5x). Here are a couple of guesses for an answer to your question:ġ) Marketing - money does matter in the real world. First there is a nice article about LED that you should read: ![]()
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