I use the nightcream together with the daycream. I got it for testing so I did monitor the changes for 5 weeks and still today.
Around week 3 I started to see some lightening on the dark spots I have. They are stronger in summer so seeing them lighten was a great achievent. The nightcream is nourishing, rich in texture. According to the description the main skin lightening ingredient works at night, so using the nightcream is the most beneficial. So I would recommend the nightcream for the main purpose and the use of SPF 50+. (Its daycream is only SPF 30).