Lamp visible in solid shading, but not in rendered mode so I'm new to blender. I was following this tutorial and found out I might have done something wrong. In object mode -> solid, I can see my lamp and the effect it has. In object mode -> rendered it's just dark and no sign of a lamp nor light.The strenght of the lamp is high enough.

Can someone help me out and tell me what I might have done wrong?
Strength 18 for cycles spot lamp is to low. Try to increase this value up to 1000 or more