Question 1

Can I not just wire this to a traditional 3-way switch?  The traditional switch will give the 3-way function, and this will make it smart/dimmable?

Accepted Answer

It's a single pole and will not work with a 3-way switch. You have to buy the Kasa 3-way switch for a 3-way circuit. When adding a Kasa 3-way switch only one of the smart switches need to be installed. The other old one can stay in place and you still get the smart function of that circuit.

Question 2

i am looking for something to install on a couple of led fixtures on low voltage that have multiple heads per fixture. Will these switches work?

Accepted Answer

These switches are direct replacements on standard household wiring.
The switches will NOT bring down the voltage for low voltage LED's which is what I think you're looking for. 
If you currently control your lighting with a standard switch you can swap that switch out with these.
If you need to lower your voltage for the LED's then you need to use something along these lines...

https://smile.amazon.com/dp/B016FG9KWQ/ref=cm_sw_r_other_apa_i_KxmTCbHRS642R

And a tap or splice it in.

https://smile.amazon.com/dp/B000VHF1B0/ref=cm_sw_r_other_apa_i_eSmTCbFRWBP1S

Question 3

Which tp-link smart bulbs work best with this dimmer switch? i need candelabra bulbs.

Accepted Answer

First off, stating that smart bulbs and smart switches serve the same purpose is rather unimaginative. If that's what manufacturers believe, then it's no wonder the product landscape is so dry. Smart bulbs have way more features than smart switches, such as the ability to change colors and program or select dynamic scenes.

Kasa doesn't make smart switches that support their smart bulbs. Currently, most manufacturers only support one or the other.  There's a strong use case for having both if you want to be able to support using the app to change your bulb color and brightness but also want to ensure visitors don't cut power to your smart bulb and can use the more manual interface that they are comfortable with. Sometimes you just want to flip a switch.

If you do some research, you'll find some manufacturers making dummy switches or plates that lock the existing light switch in the on position and which are capable of communicating with compatible smart bulbs. GE or Lutron partnered with Philips Hue have some capabilities in this area. The options are pretty limited, however, and I haven't found an aesthetically pleasing option that is friendly on the wallet.

For the second part of your question, Kasa doesn't currently have an E12 candelabra bulb, smart or otherwise. There are not a lot of inexpensive options for quality, smart candelabra bulbs. You are probably better off going with a "dumb" bulb and a smart switch unless you want to drop some serious cash, in which case the Lutron Aurora is a dimmer switch that is compatible with Philips Hue which makes an E12 candelabra bulb capable of full color manipulation.

Question 4

If I don't have a neutral, can this still work as a non-smart switch?

Accepted Answer

A neutral wire is required for installation and functionality of the smart light switch.

ASIN	B0BTMWZH3K
Actuator Type	Push Button
Best Sellers Rank	#27,501 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #72 in Dimmer Switches
Brand Name	Kasa Smart
Circuit Type	1-way
Color	White
Compatible Devices	Apple HomeKit, Amazon Alexa, Google Assistant
Connectivity Protocol	Wi-Fi
Connector Type	Screw
Contact Material	Copper
Contact Type	Normally Closed
Control Method	Touch
Control Type	Full
Controller Type	Amazon Alexa, Apple HomeKit, Google Assistant
Current Rating	2.5 A
Customer Reviews	4.4 4.4 out of 5 stars (1,096)
Included Components	3xWi-Fi Light Switch, 3xWall Plate, 12xWire Nuts & Labels, 1xQuick Start Guide
International Protection Rating	IP00
Item Dimensions	5.04 x 3.33 x 1.77 inches
Lower Temperature Rating	32 °F
Manufacturer	TP-Link
Material Type	Polycarbonate
Model	KS220P3
Mounting Type	Pole
Number of Items	1
Number of Positions	3
Operating Voltage	110 volts_of_alternating_current
Operation Mode	ON-OFF
Part Number	KS220P3
Specification Met	UL
Switch Type	Dimmer
Terminal	Spst
UPC	840030709630
Unit Count	3 Count
Upper Temperature Rating	104 °F
Warranty Description	2 years
Wattage	150 watts

Kasa Apple HomeKit Smart Dimmer Switch, KS220P3, Single Pole

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