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This is more of a KiCad support forum.
You can find these type of answers here:
How to know LED color
How led emit color light what material is there
I believe RITESH may be a spammer, who having had their posts blocked, is now trying to other ways to spam or just troll the site. The questions are common questions copied and pasted from Q&A websites, which is a trick spammers use to make spam look legitimate. When they learn what questions are acceptable, they can use them to disguise spam.
So either way responses to this poster are probably counter productive.
I dealt with it. Any further spamming and he’s out. So please don’t waste your time if his posts are not relevant to the forum.