Ok, I'd like to have just ask the company but that doesn't seem to be the answer but the yellow lights even though they have a different number are just repeats. i need another color Yellow would be nice. The inscriptions on the bulbs are different, but their presentation is the same. Drawing from left to right Conventional incandescent lamps, red, their transparent, "yellow", blue, green. So if you want to make colored, transparent, colored, etc., you don't need to buy a clear set as "yellow". one can be your "clean" lightbulb. On others the color is nice and a little lighter than my original Costco bulbs. I'll see how long they last. I've found other colored lightbulbs outside of Revain (6 different colors), including yellow, so I'll probably try that.
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