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Old outdoor lighting transformer - need wattage help


BJP91's Avatar
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12-30-17, 11:37 AM   #1  
Old outdoor lighting transformer - need wattage help

I have an old, but functional, outdoor lighting transformer that I am currently using. I need to convert from 4 watt incandescent lighting to LED, because the current fixtures are becoming obsolete. However, the wattage for my transformer is not displayed anywhere on the transformer, or the paperwork. It is a Malibu Intermatic - possibly an ML121 or ML200 series, but I can't be sure. The only numbers on the actual transformer are tags that were glued onto it - 154LV24409 & 154LV23080. I have no idea if those numbers would help to determine wattage. Can anyone help? Thanks. I have included 4 pics...
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12-30-17, 06:49 PM   #2  
The two long numbers are sticker numbers...... not model numbers.
ML-121 is a 121 watt transformer.
ML-200 is a 200 watt transformer.

It could be either one as they both looked the same. Figure at the minimum you have 121 watts at 12vac. That's a lot of LED lighting.


~ Pete ~

 
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12-31-17, 08:26 AM   #3  
On another forum, someone thought it was model ML-88T - which would be 88 watts. That being the possible case, I guess I'll have to stay below 88 watts.

Also, I am confused by how to interpret max wattage of all the light fixtures I use. LED lighting usually displays not only the actual LED wattage but the "equivalent" non-LED wattage. Example: A 4.5 watt LED that displays an "equivalent" of 20 watts. To determine total wattage, I would multiply 4.5 by the total number of fixtures - NOT 20. Is this correct?

Thanks.

 
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12-31-17, 09:26 AM   #4  
It's not an ML-88T. That transformer uses a front timer..... not a top timer like in your picture.
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You use the actual current draw of the LED..... not its equivalent wattage.
A 4.5w LED uses 4.5w of AC power.

Correct..... the actual wattage x quantity of lights = wattage.
You're looking at 25 fixtures.


~ Pete ~

 
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12-31-17, 10:24 AM   #5  
My transformer is probably more than 20 years old; so, I am not sure that they were even made the same back then. Do you know?? The old installation instructions I did find depicts/displays multiple timers, all with top timers covered with a lid. (Yes, I recognize none of the ones in the instructions matched mine perfectly - not sure what to make of that...)

Assuming that the LEDs will light up much better than the old ones, I would likely need no more than 7-8; one per tree. Right now, I have 14 lights, two per tree. Either way, as long as I don't want to add more lights than I already have, I would be well under 88 anyway.

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12-31-17, 10:35 AM   #6  
I don't know if they'll light up better. They will certainly last a lot longer using less power. You're going to have to experiment to see what kind of throw the LED fixtures offer.


~ Pete ~

 
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12-31-17, 10:40 AM   #7  
Pete - I edited the last post while you were responding. Did you check out the pic of the installation instructions I finally found??

 
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