The CND lamp should be used for CND Shellac, however if some of your colours are the old formulation they won't cure under LED light.
When CND launched the LED lamp the formula was tweaked, I remember most still cured but i specifically remember Iced Cuppucino wouldnt cure, and a few others I can't remember. You'll need to invest in new bottles, or continue with the UV lamp until they are used up.