You didn't mention wire length, but that's probably what's causing the
voltage drop (=brightness). Use a 15V AC voltmeter and read the
voltage at the lamp closest to the transformer, and at the lamp farthest.

Could be several volts difference (drop) if it's 100 feet apart.

Since some lights are ok, and others are dim, the transformer is doing
fine. Check the bulbs by putting a dim bulb in a socket that had a
bright bulb, if it stays dim, its the bulb, if it gets bright, its a
wire problem.

solutions: put the transformer near the middle of the string, use larger
gauge wire, put every other light from the old wire on a new wire that
also goes back to the trasformer.

-larry



Greg R. wrote:
I recently bought a house that has low-voltage outdoor Malibu lighting
(by Intermatic). Currently it has a 200w power supply to power 10 tier
lights and 5 20w flood lights. The setup is as follows, power supply -
3 spot lights - 10 tier lights - 2 spot lights. The strange thing is the
first 3 spot lights in the circuit are much brighter than the last two
spotlights (in relation to the the power supply). All the tier lights
seem the same brightness. My question is, why are the last two spotlights
so dim? I would assume that if the power supply was not strong enough,
all the lights would be dim. Do halogen bulbs dim as they are burning
out? Could they be different bulbs that the brighter flood lights (the
fixtures appear identical). Any suggestions?