I am back. So I have some information to share, and another series of questions. I think there is some kind of issue with the driver from @Obi2000, but don't know enough about what I'm looking at to try to fix it. @mavrrick58 I am tagging you as well because 1) you were very helpful before, and 2) you have also worked with writing a driver, and might have some ideas of what I can try.
H6148 work the same as H6141. They recognize On/Off, RGB and ColorTemp (but their color temp is way better reproduction due to the white led). All options associated with "color bulb" work in the dashboard (color, temp, brightness). As a side, Hey Google also works in changing the colors with the proper wording (soft light instead of warm light, but others work as expected).
When grouping H6141 OR H6148, all options EXCEPT brightness work in the dashboard (and as a side note, Hey Google as well). I am seeing some errors in the logs that I don't understand. I feel like I'm so close (isn't that always the case). Google confirms it is changing the brightness, but then just doesn't. The slider goes up and down in the dashboard, but there is no adjustment made to the lights. This is only with the group. Individually, they do everything as expected. But grouped, they do everything EXCEPT brightness.
This is the error I am seeing, and I'm hoping it makes sense to someone else.
[dev:221] 2021-01-30 11:29:48.922 am [info] Upper Cabinets [G] level was set to 51%
[dev:217] 2021-01-30 11:29:48.918 am [error] groovy.lang.MissingMethodException: No signature of method: user_driver_Obi2000_Govee_Immersion_LED_Strip_550.setLevel() is applicable for argument types: (java.lang.Integer, java.lang.Integer) values: [51, 1]
Possible solutions: setLevel(java.lang.Object) (setLevel)
I'm happy to provide any additional information, just please be specific in what you need and if it isn't obvious, how I get it.
I'm also happy to try to do any kind of testing with the lights that I have, again, knowing you'd have to be pretty specific as I'm pretty much a newbie who has done a TON of reading and am willing to learn, but don't exactly know what I'm doing. I mean, I've got 4 sets of lights in here now, working...and even managed to figure out how to splice some of them together...but yeah, just enough knowledge here to be dangerous. I have the H6141, H6159 and H6148.
ETA: It seems that the group does in fact change the brightness, however the delay is many seconds...at least 25. I was walking away before it would implement the change. I still think there's an issue here with this delay and error message that I just don't understand, but maybe that will add more information that is helpful.