"Greg R." wrote in message
news
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?

The wire connecting the lights of adequate size? No matter how many watts
the power supply is capable of delivering, if the wire is sized too small
the resistance of the wire will cause a voltage drop and the lights at the
end of the line will not reach full potential.