I thought both bulbs have 4 modes: yellow, blue, white, other. However, one bulb is Blue: Blue Fire, Blue Mood, White, etc. The other bulb is YELLOW: Yellow Fire, Yellow Mood, White, etc. I wish I knew, so I'd buy 2 amber lights instead. I hope this review helps the next person before buying. It wasn't clear in the description and no questions and answers were provided. Lightbulbs work perfectly. As described only 3 stars.
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