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Question DetailsAsked on 5/7/2017

transformer rated for 35W. Each LED landscape lights is 1.5 watts. Can I install 27 lights ? (total of 40.5 watts?

I bought this QUICKFIT landscape lighting from Walmart. Originally was planning on having 20 lights (30 watts), but need 27 lights instead. The transformer capacity is 35Watts, and I prefer not to use an additional transformer.
Any thoughts ? suggestions ?

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1 Answer


Continuous load transformer like this should be rated at 125% of the total attached load - so should be rated at 37.5W for 20 lights - so actually, you should (technically) not exceed 18 lights on that transformer. 20 you could probably get away with, but 27 I am thinking fried plastic time - particularly since the transformer on that item was probably made by the lowest bodder in China - do you want to risk frying it right off ?
I would figure your maximum number of lights (including any additional branch you might add in the future), and have not more than 18 per branch. If certain 27 is all you will want, but 14 and 13 respectively on two separate transformers - less load than rated is not bad for a transformer. And note those are the rarted operating wattages - startup of a whole string could be more than that, so could be stressing the transformer at that. [Technically, should be able to handle short-term 25% overload during startup, but I would not count on it with a cheapo transformer/kit] Or cut you number of lights down to the UL rated number on the package (probably 18 or 20 ?) - because if you exceed the rated capacity on the package you risk the insurance company denying coverage for gross contributory negligence if you have an electrical fire from it. Looks like second transformer is about $16 at Walmart - but on clearance along with those landscaping kits, so get one quick if you intend to (appears to be made by Westinghouse - their 35W landacape transformer is also available at Lowes and Amazon, per a web search.)

Answered 3 years ago by LCD

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