Started my first paver light install, everything went great until...my sixth light was dim, I thought maybe voltage drop,maybe wrong wiring, maybe bad connection, but then next light is strong. Then the next two lights are dim. The run is only about 40 feet and I have 8 7watt lights on a 121 watt transformer. I redid the connections, switched bulbs, can't figure it out. Please help, I'm hoping the lights are bad because they were apparently on the shelf for a long time.please give me any info if you have it. the paver lights are Tahoe brand.