You can try resetting LIFX bulb to solve the issue. Sometimes, even after resetting LIFX vidmate24 bulb, it may not appear in the network list.
Try to search the reset button from your modem. Press it using a pin for 5 seconds. The password will be reset successfully. You can also change it by using the LOgin admin pannel.
Read= https://dlinkaplocal.net/easy-to-recover-your-d-link-wireless-router-password/31 for more details.