You can manually adjust it so it doesn't gradually get brighter and darker. It has about 6 hours of peak brightness on 24/7 mode. A lot of us here out it on a timer from 6am to about 10 pm so it has a complete blackout. Once it kicks on due to the timer, it stays on whatever mode you left it on. So mine will start on 6am on the 24/7 mode.
The newer 24/7 will be fully programmable, stronger and go completely dark at night. The only thing, it will cost more than the current 24/7.
I'm pretty satisfied with what I mine.
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