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I just finished installing a new exhaust fan in my bathroom. I have access to the ceiling before I patch up the old hole where the old fan used to be. A lot of people tend to connect a recessed light to the exhaust fan but I wanted to know if I could "daisy-chain" an LED strip light so that it could illuminate the side of the walls as you can see in this photo:

Here are the LED lights that I bought:

enter image description here

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    The simple answer is yes, this is possible, but you don't provide nearly enough detail for your situation. First, are you even in the US? Second, what kind of LED strips will you be using? Many daisy-chained off each other, meaning one end of the stip is powered and the other is either terminated or bridged to another strip. Third, your description of "daisy-chaining" seems inaccurate. You would actually be powering the LED strips in parallel. Essentially, we need more information about what you want to do and what you're willing to do to make it happen. – Hari Ganti Mar 16 '18 at 19:49
  • Yes. my exhaust fan even has a standard US plug i used a 3:1 adapter with to do the same... – dandavis Mar 16 '18 at 23:32
  • Sorry, I normally add "USA" at the end of my title when I ask questions. I didn't know if it did any good and the one time I didn't type someone wants clarification. :) When I say daisy chain, I mean split the Romex in half, one half to continue powering the exhaust and the other one to power the lights. I am not certain what lights I want to get but the room 8x6 so that's about 28ft. I haven't decided on what to get but whatever works for a bathroom and allows me to run one continuous LED strip. The photo I provided should make that clear to you, Hari. – Adrien Mar 17 '18 at 1:07
  • So, you want the LED strip to power up when the fan turns on? You would add the LED driver to the circuit of the fan. Several ways to do this, hardwire or cord? I would do this "split" before it gets to the fan, otherwise you may get a flicker or something related to the fan running. I had CFLs do this years ago, every time the fan came on, the lights in the bathroom do too, causing a flicker. It had to do with how the previous person wired the sockets. – Jeff Cates Mar 20 '18 at 14:02
  • How do I connect these so they don't flicker? I am providing a photo of the LED lights that I bought. I am going to run the Romex from the fan and then put an outlet and use a USB adapter to keep these plugged in so they turn on when the fan turns on. I am changing the design a bit. I bought four 19" LED strip lights. I am putting two of them on each of the two cabinets I have. One will go at the top of the cabinet to illuminate upward and the second one will go at the bottom of the cabinet to light the cubby hole. So I am going to run two Romex wires in two different directions to do this. – Adrien Mar 20 '18 at 17:52
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Since your LED strips are powered by a 5V DC the correct answer is:

No, you can't directly add DC equipment to an AC circuit.

However, you can add a 110 V AC outlet to the switchable part of the circuit that the fan is on and plug in what ever adapter you were planning on running your LEDs off of from that.

Assuming you want these LEDs on the ceiling near the center of the room, you probably want to use a ceiling box (for lights) instead of a standard switch box so that any future owner, or change in taste will allow you easily to convert to another fixture. Picture of ceiling  boxes along with a cover like this: enter image description here They also sell these in decora or single outlet style: enter image description here

Alternately, (and what I'd probably do) in place of a ceiling box, you could install a recessed light fixture, then use a socket to outlet adapter and plug your 5V DC transformer into that:

socket adapter

I see that in your comments you are worried about flickering. This shouldn't be a problem, unless the circuit is overloaded (if so you need to run a new line from your breaker box), or had a ton of compact florescent bulbs on it (they dirty the power by only pulling during the maximum voltage differential).

  • The circuit itself for the bathroom only has three LED Edison bulbs that don't even equal 35W total. Then there is the power of the fan itself. I think I should be good to go. I will look for a 110V AC outlet to connect to the Romex in the ceiling to power the LED lights. Thank you! – Adrien Mar 20 '18 at 20:06

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