Help with ceiling light on loop

Hi, I've got 2 ceiling lights in my hallway, I've taken both down & replaced with pendant lights. My problem is with one of the pendants being very dull. The first light had only one cable with a black, red & earth cable, easy to wire up & works great! Next light has two cables, each has a red, black & earth cable. When I removed the previous light both black cables were connected together and both refs connected together. My problem is I've wired it up as per a 2 cable loop but it is seriously dull, more like 10w than 60w, where have I gone wrong?? It's driving me mad!!

 

Hi
1, both lights work from the same switch, there is a switch at either end of the hallway
2, yes they both switch on/off it's only one that is extremely dim
3, there were only 2 cables coming through ceiling and attached to previous light fitting
4, I'll post some pics of the working pendant shortly

 

Pic 1 - dim light
Pic 2 - bright light
Pic 3 - pendant wiring of working light
Pic 4 - both lights in situ