MN20 is the LOLA, MN21 the HOLA. When shining them on a white wall, the difference might be less drastic since those are too bright for the eyes anyway. Try the test outside and you'll notice that the HOLA puts out a more massive wall og light with a slightly more oval beam. If you do not see any difference then, there might be something wrong.
WELCOME to CPF, rist member of 2004 !!!!!!!!!!!!!!!!!!!!!!!!!!!
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bernhard