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Old 09-15-2012, 06:02 PM   #1
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low voltage transformer


i picked up three sets of low voltage hi-intensity landscape lights. each set has 12 lights and a 10 watt transformer. i want to run 2 sets off the same transformer so so i figure a 20 watt will do but seems hard to find a 20 watt. i already have a 40 watt but how do i cut the wattage down on it, from the 40 to 20 watt.

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Old 09-15-2012, 07:17 PM   #2
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You can connect a 20 watt load to a 40 watt supply without a problem. Based on the low wattage requirement fot each string, I assume these are LED.

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Old 09-16-2012, 02:09 AM   #3
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Read the output real carefully.
A lot of those little plug together sets are DC. Most outdoor landscape transformers are 12V AC.
If you put DC LED's on an AC transformer, you will have a problem.
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Old 09-16-2012, 08:26 AM   #4
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well after doing the math, each blub is 12 volt VDC .375 watt. thats under 16 watts for the 34 lights i installed to one malibu 40 watt transformer. the only downside i see to these westinghouse hi-intensity led lights is the replacement cost of the blubs, ofcourse regular outdoor landscape light arent cheap either, amazing that you can buy a complete outdoor
light kit for only a couple bucks more than the lights sell for by themselves.
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Old 09-16-2012, 09:39 AM   #5
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I wouldn't worry about needing to replace any of you LED bubs any time soon. The a considerably longer life than tungston bulbs.
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Old 09-16-2012, 10:26 AM   #6
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well thats whay i went back and bought the third set they had for sale, just for the fact that the blubs cost so much. i only paid $10.00 per set. installed 34 of them yesterday and checked them out last night, look pretty cool. still have another 100 + feet to bury.
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Old 09-16-2012, 10:27 AM   #7
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The output from your Malibu transformer is most likely AC voltage. The bulb specs you posted says volts DC.
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Old 09-16-2012, 01:22 PM   #8
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its 12 vdc. but then if youd checked before you spoke youd know that. no wonder so many of these forums die, to many idiots saying something thats not true. not having a clue as to what there talking about. still dont understand why people chime in with a answer when they have no idea what there talking about, or is it that they actually think they know what there talking about. now my water softener has a low voltage ac transformer.
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Old 09-16-2012, 02:45 PM   #9
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Quote:
Originally Posted by hotrod351 View Post
its 12 vdc. but then if youd checked before you spoke youd know that. no wonder so many of these forums die, to many idiots saying something thats not true. not having a clue as to what there talking about. still dont understand why people chime in with a answer when they have no idea what there talking about, or is it that they actually think they know what there talking about. now my water softener has a low voltage ac transformer.
Don't you just love it when they get snarky and then go into some unintelligible rant. NOT
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Old 09-16-2012, 04:09 PM   #10
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Quote:
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its 12 vdc. but then if youd checked before you spoke youd know that. .
You did not provide that information as to which transformer you had. I was just trying to prevent you from ruining the lights you bought. Sorry for trying to be helpful.

12 Volt lighting AC or DC

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Last edited by Jim Port; 09-16-2012 at 04:24 PM. Reason: added links to support AC output, not DC.
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Old 09-16-2012, 04:39 PM   #11
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Quote:
Originally Posted by hotrod351 View Post
its 12 vdc. but then if youd checked before you spoke youd know that. no wonder so many of these forums die, to many idiots saying something thats not true. not having a clue as to what there talking about. still dont understand why people chime in with a answer when they have no idea what there talking about, or is it that they actually think they know what there talking about. now my water softener has a low voltage ac transformer.
Hotrod....it is somewhat 'frowned upon'....if not down right rude to be so 'negative' when someone is trying to help.

Actually, it's posters like you that get their knickers in a twist and piss people off with the unjustified comments.

The reality is....if you really understood what Watts were, you would then understand that a 1000w transformer would have worked just as well as a 40w transformer.

It's best to not piss off the regulars....tons of info....and if mods have to take sides....it doesn't take a brain surgan to figure out who will win.
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Old 09-16-2012, 07:06 PM   #12
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Just in case hotrod shows back up.

I'd bet you have a ML 40 ( aka DA-40-12W-1)

It just says 12V on the output. Many people assume 12V is 12VDC, but that is not always true.

In the case of the ML40, it is 12VAC.

Tell us when your bulbs fail.
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Old 09-16-2012, 11:34 PM   #13
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Tell us when your bulbs fail.
Don't hold tour breath. With the attitude already shown do you think they would admit they were wrong?
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Old 09-17-2012, 02:01 AM   #14
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Not holding breath.
And no, I don't expect him back.
But once in a while you get surprised :-)
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Old 09-17-2012, 10:47 AM   #15
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sorry, i was wrong, it happens, even to the best. your right no call for how i reacted to you trying to help. the transformer is 12 VAC 40 watt. now what to do. i have the three 10 watt 12 VDC transformers that came with the kits but hate to wire them all together, the light are all wired together. now i have seen a lot of led landscape lights that run off 12 VDC and 12 VAC. has to be a easier way of doing it.

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