Hi

I have recently installed 6 (35 Watt) landscape lights, on a 300 Watt
transformer.

It is 12 V AC, on about 50 meters of cable.

Light number 1 and 2 perform as expected.
Light number 2 is about 20 meter from the transformer.

Light number 3 - 6 is dim, but does not get progressively dimmer from 3
to 6.

Why would this be?

I am ruling out excessive voltage drop because light 3 and 6 is glowing
at the same brightness.

Could this be because of a short?

Thanks