This is not my invention, so stehts in the manual. Accordingly, the 30W power unit may only 15W lamp power to operate. Anyone who thinks he could connect with LEDs in total 30W will have no fun. The power supply is almost twice the size of a halogen lamp transformer. Is just not a transformer but a power supply. That just has a few more components. Why then are used but in terms of size as small clamps I do not understand. With the insulated screwdriver I usually use I did not come to the terminal off. All in all, the part within its borders but that what it should. In the product description, only the consumer power should be corrected. My vote should not be deterred from buying but only inform.