There are a lot of factors which may have influenced your results. For starters, what are you basing your expectations on? Are you comparing like for like performance predictions for the two panels?
CIGS is a type of thin film technology. Thin film photovoltaic panels can have a potentially better spectral response because the layers are VERY thin. This means that you can have a number of different layers which absorb different parts of the light spectrum better. The ammount of benefit that this provides will depend upon your location. The further north you go in the northern hemisphere, the greater the proportion of light in the blue part of the spectrum. The improved spectral response from the thin film panels should increase the ammount of this blue spectrum light that is absorbed and thus increase the ammount of solar resource that the panel can use. Do you think that this is the issue the literature you were reading is refering to?
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'There are only two ways to live your life, accept things as they are or take responsibility for changing them' Bhagat Singh (even if you don't agree with how he chose to apply this philosophy)
"Just ignore it all" {CT}
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