spreading LED beam

I just bought some powerful IR LEDs that have a narrow beam, the guy says
15-20 degrees, no specs, hmm. Anyway, I'd like them to be more diffuse say
60 degrees 2x half maximum.

Should I just lightly sand the top of the lense?

Is there a better method, eg. chemical etch.

Am I going to lose total output due to surface absorption?

thanks
Lyle


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