Hi there! I understand your Sengled lights stopped working and you’re unable to control them through the Sengled Home app. Let's try to get this sorted out together.

First, could you tell me a bit more about the situation? For example:
- Are all your Sengled lights unresponsive or just some of them?
- Have you recently changed your Wi-Fi network or router settings?
- Are you able to control the lights physically by using the wall switch?
- Have you tried restarting the Sengled Home app or your phone (Mac in your case)?
- Is the Sengled hub (if you use one) connected and showing as online in the app?

Meanwhile, here are some initial steps you can try that often resolve these kinds of issues:

1. Check the power: Ensure the light switches controlling the Sengled bulbs are turned on fully.

2. Power cycle the bulbs: Turn off the light switch for the bulb(s), wait about 10 seconds, and turn it back on. Sometimes the bulbs need a fresh start.

3. Restart the Sengled Home app: On your Mac, fully quit the app and relaunch it.

4. Ensure network connectivity: Make sure your Mac and bulbs are on the same Wi-Fi network (2.4 GHz band is usually required for many smart bulbs).

5. Check router and firewall settings: Some routers might block the bulbs’ MAC addresses. Sengled devices have MAC addresses starting with “B0” — make sure these are not blacklisted or blocked in your router settings.

If those steps don’t do the trick, the next best move would be to try resetting the bulb(s). Usually, toggling the bulb on and off several times (like 5-10 times in a row) makes the bulb blink to confirm reset, but I can walk you through the exact sequence for your model.

Let me know what you’ve tried or observed so far, and we’ll take it from there!