Welcome to the Roku Community and thanks for posting regarding using your Roku Smart Home light bulb.
Are making sure that your mobile devices are on the same wireless network and frequency as your Roku Smart Home camera? In addition, are you making sure to use the Alexa app and have downloaded the Roku Smart Home Skill in order for the Roku Smart Home devices to be detected?
For more information about how to control your Roku Smart Home light bulb, visit our Support page here: Control your smart home devices with Alexa
Please keep us posted what you find out and we will be more than happy to continue assisting you. We look forward to hearing back your response.
Roku Community Moderator