You may want to consult with a reputable local electrician or electrical supply company. Using lighting they have experience with may pay off in the long run.

• Elco Lighting 4" Housing for Remote Transformer and Trims
• Euri MR16 LED bulbs

I agree on using bulbs in a fixture instead of an LED fixture. But they are getting harder and harder to find. Even range hoods and bath fans. They are built in and no replacement available. You have to replace the whole thing. That is what is called penny wise and pound foolish. Sorry, LED technology is not that good to last even the predicted 10 years, let alone the 20 or 30 that I would hope a range hood or bath fan will last. So we manaufacture and throw away even more stuff instead of less? Bad economy.

Installing a retrofit LED lamp in an incandescent low voltage fixture powered by a remote transformer will be expensive. Why is a low voltage circuit important to you?

yes 4inch remote transformer (make sure to put the transformer where accessible) low voltage mr 16

maybe look at exterior low-voltage cans?

@mainenell: "I agree on using bulbs in a fixture instead of an LED fixture. But they are getting harder and harder to find."

No, they are readily available. Manufacturers such as Halo and Juno produce housings and trim for a variety of different bulb types (e.g., screw-in, pin), both LED and Halogen. The Halo E4RTATSB housing, for example, accepts common E26-base bulbs.

@RES2 This is new construction so I wouldn't be installing retrofit LED in incandescent fixture. Everything is from scratch. I'm just thinking why run all that Romex if I don't need it. If all the lighting on the circuit is going to be low voltage, why not make that whole circuit low voltage. We are still early in the process (still in design phase, construction not started). I will definitely be talking to lighting suppliers and electricians, but I oftentimes get a broader range of ideas on this forum.

First, halogen low voltage lighting in a house requires a "transformer" and LED low voltage lighting requires a "driver". The primary difference is the driver also protects sensitive LEDs from voltage or current fluctuations.

Multiple low voltage circuits on multiple transformers will be quite expensive and long wring runs will require larger wire sizes so the net result will be an increase in lighting cost.

Currently new residential low voltage recessed LED fixtures powered by a remote LED "driver" are used for exterior lighting systems. As wdccruise suggested, a workaround solution for interior recessed lighting is to power a recessed low voltage halogen (incandescent) housing with a remote transformer and install an MR16 LED lamp (bulb) with the necessary adapter built into its base.

A cheaper more conventional solution would be to use a "retrofit" line voltage recessed incandescent housing with a "retrofit" LED PAR lamp that has a "driver" built into its base (i.e. a common LED spot or flood).

The only reason to pay a premium for low voltage MR16 halogen lighting is that it produces a far superior focused light with good longevity. It's still the gold standard.

Unfortunately, that is not the case with MR 16 LED lighting so I can think of no reason to use it in a house.

I would agree with the above, you also will contend with voltage drop and resistance.

What's wrong with "running all that Romex if I don't need it."? Is it the size of the Romex you don't like? Or the color? I doubt it's the expense; there isn't much cheaper wire which can be run behind walls than Romex (or it's equivalent), especially if you're already getting a lot for your other runs.

Like @mtvhike, I don't understand why you are attempting this low-voltage setup. Just use 120-volt housings, trims, bulbs and dimmers if for no reason other than the wide variety of products available for this setup.

@wdccruise I guess I didn’t make myself clear. The manufacturers of the range hoods say that the LED lights are not serviceable by the consumer.

@mainenell: My last comment was addressed to the OP, not you.

Even if you found a way to hook up LED fixtures to remote LED drivers, because LEDs are so sensitive to voltage fluctuations, the wiring would probably be 14 ga. landscape lighting wire at a higher cost than 16 ga Romex. Using remote low voltage transformers would be even more expensive.