Great news!
I have successfully added my Sylvania Smart+ Wifi Bulbs to HA using LocalTuya.
A Tuya IOT Development Account is needed but the instructions in the Add-On are very good.
Just note that you will lose the ability to control the lights using Amazon or Google or the Sylvania App. Only able to control with Home Assistant after connecting them to LocalTuya.
Once I got LocalTuya configured and got the Device ID and key using tuya-cli I was able to add the bulbs to my configuration.yaml. What follows is just one of my bulbs. A new host entry is needed for each bulb. Hope the following helps:
localtuya:
- host: <Local IP of Bulb>
device_id: <Device ID from tuya-cli>
local_key: <Local Key from tuya-cli>
friendly_name: Sylvania Smart+ Wifi
protocol_version: "3.3"
entities:
- platform: light
friendly_name: LR Door Light
id: 20 # Usually 1 or 20
color_mode: 21 # Optional, usually 2 or 21, default: "none"
brightness: 22 # Optional, usually 3 or 22, default: "none"
color_temp: 23 # Optional, usually 4 or 23, default: "none"
color: 24 # Optional, usually 5 (RGB_HSV) or 24 (HSV), default: "none"
brightness_lower: 10 # Optional, usually 0 or 29, default: 29
brightness_upper: 1000 # Optional, usually 255 or 1000, default: 1000
color_temp_min_kelvin: 2700 # Optional, default: 2700
color_temp_max_kelvin: 6500 # Optional, default: 6500
scene: 25 # Optional, usually 6 (RGB_HSV) or 25 (HSV), default: "none"