Answer: The mature size of the lemons will be about 3", although younger trees sometimes produce smaller lemons. You raise an interesting point about the tint on your glass blocking UV rays. I don't have an answer for you - it depends upon the type of tint applied. If you're concerned, you could supplement natural light with a full-spectrum gro-light during the winter months and take your tree outdoors during the spring and summer months. Best wishes with your lemon tree!
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