Landscape Lighting issue...

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1793

1793

Senior Member
Location
Louisville, Kentucky
Occupation
Inspector
I have a customer who is having the only 11 watt bulb "blow" about every three weeks. This one and only light is powered by an 88 watt transformer. This 88 watt transformer is the lowest wattage transformer Intermatic has, according to their website.

What can we do to make the bulb last longer?
 
1793 said:
I have a customer who is having the only 11 watt bulb "blow" about every three weeks. This one and only light is powered by an 88 watt transformer. This 88 watt transformer is the lowest wattage transformer Intermatic has, according to their website.

What can we do to make the bulb last longer?
Click to expand...
Whats the voltage at the fixture? Can the transformer support such a small load?
 
1793 said:
I have a customer who is having the only 11 watt bulb "blow" about every three weeks. This one and only light is powered by an 88 watt transformer. This 88 watt transformer is the lowest wattage transformer Intermatic has, according to their website.

What can we do to make the bulb last longer?
Click to expand...

Some transformer demand a minimum wattage. You may not have enough watts which may be causing an issue-- not sure how but....
 
This 88 watt transformer is the lowest wattage transformer Intermatic has, according to their website.

I'm not seeing an 88 watt but there is a 60. Anyway, have you measured the voltage AT THE LAMP? I suspect that because you have little load on the transformer the voltage output is going to be higher than what it is rated- which is with an 88 watt load and some amount of wire.

-Hal
 
You're not hooked to the boost tap at the transformer, are you?

Many landscape lamps cross to an automotive lamp and handle vibrations and such a lot better, if you suspect that might be an issue.
 
I had this same issue once. reread the manufacturer's specs and they required the first fixture to be no closer to the xformer than 10 ft., changed the wire layout and had no more problems with that fixture.
 
Fishin-trician said:
I had this same issue once. reread the manufacturer's specs and they required the first fixture to be no closer to the xformer than 10 ft., changed the wire layout and had no more problems with that fixture.
Click to expand...

I'll try to get back to my customers to look at this and check the voltage at the light.
 
Fishin-trician said:
I had this same issue once. reread the manufacturer's specs and they required the first fixture to be no closer to the xformer than 10 ft., changed the wire layout and had no more problems with that fixture.
Click to expand...
This helped me cure a similar issue as well. Also I cut the leads off the light and wired a tail to help make it easier to take a voltage reading, I'm assuming these are the lights with the compression clips.
 
As mentioned there is a minimum wattage one can connect to those transformers, I have measured an open circuit voltage of around 16-18vac on the typical transformers.

For an 88 watt transformer I would figure at least 20-25 watts to drop the voltage to 12-13 volts.

Or you can add a length of wire to drop some voltage too.
 
12.1v and 11'...

12.1v and 11'...

Voltage at the transformer is 12.1 and the same at the light, lamp.
The light fixture is about 11' from the transformer.

Anybody have any other thoughts on this?
 
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