Electrical Questions? Ask an Electrician Online.
Welcome. My name is XXXXX XXXXX would be glad to assist.
Read your information,
Most of the installations I do, I use a standard outside landscape fixture, rated at 120 volt and connect the low voltage. There is so much of a better selection as you have already noticed.
There is no problem doing this at all because the fixtures are rated for higher voltage than you are using, so all is fine
OK, so I think you are confirming my belief then.
But I have heard that led has polarity that needs to be adhered.
With the LED, you need to purchase Bulbs that have an INTERNAL resistor already inside
In other words, a bulb that is ready to go'
Well, these are the bulbs that I can buy at normal retail outlets - correct?
OK, so the most outside fixtures I see have standard e27 bases.
Yes and no, depends on the manufacturer.
I use E-27 and MR-16 personally depending on location and light level needed
I'm thinking that I just need to buy a 12 volt, e27 base.
Good reflectors help to use the E-27
12v e27 base.
ok good. I'll look up the mr-16.
Just looking for something around 40-watt lumens equivalent in led. I like light around 3000 color.
I have some really bright MR16 LED's in my kitchen that really are amazing on light output.
Many manufacturers are misleading on their Lumens output, so be cautious and use a single trial before buying many of the bulbs
So, once again (sorry), I am going to simply connect both wires from the transformer to EITHER of the 110vac wire leads which connect to the bulb base. The ground wire on the 110vac fixture is ignored. Correct?
Yes, the low voltage cable is only 2 wires.
I can connect this way because an internal resister handles the polarity.
The white on your 120 volt fixture would be equal to the negative side of low voltage
OK, I see the MR16 is 2-pin.
Correct and so is an E-27
the outside shell is negative
But these have internal resisters also? Or would I have to pay attention to polarity with them?
The bulbs you buy will have the resistors built into them, so they are ready to go. Polarity is connect your white wire to the negative lead on the 120 volts fixtures
white negative, black positive
That way you are uniform
OK, I can do that. Sorry I might have E27 wrong. For simplicity I was going to use a screw-in bulb. Thought that base was E27.
Be sure to use heavy gauge wire on the low voltage , they have calculators out for the distances and wattages to keep from getting voltage drops.
Yes, I am studying the voltage charts.
Yes, E-27 is a screw in bulb. The shell is negative and the point on the end is positive
The bulbs are ~120 feet from the transformer. But I am installing very few bulbs ...probably consuming less than 80 watts among all of them.
I bought 12 gauge wire, and can buy heavier guage if needed.
So far, the math I've done shows that 12 gauge is sufficient for such a low run.
Ok, still get a chart for wire length for the wattage to be safe and add for future
low wattage run
One of the information sheets I saw showed a 'closed loop' type of arrangement which was interesting.
Looping back to the transformer so if the cable is broken?
No. Something to do with reducing voltage drop at the end.
But ... my application is simple and over-engineered anyway. So I ignored the advice.
Yea, I just take time and get it all installed properly with no problems
Tommy, you have been very helpful and I thank you for your clear and informative answers.
You are very welcome, glad to assist
We're done - great job! Thank you.