Hi TJH, and welcome to English Forums. " Abbreviations will use "an" if they start with F, H, L, M, N, R, S, or X, as well as with the vowels. An FBI agent came to my house asking about you.
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TJH126I have noticed that "an" has started to be used frequently before words beginning with "L." Such as let's say the acronym "LED"They aren't words but abbreviations. Each letter is said separately.
Not all vowels though. We say, "a UN meeting" and Y (even though it's only sometimes a vowel) is also "a YMC". Otherwise, you're completely right.
an LED kit
You are mistaken if you think the written letter that begins the next word determines the choice between 'a' and 'an'. It is the pronunciation.
an ELL EE DEE kit is the pronunciation.
CJ