Some more expensive versions have specs for light life.

Approx 120,000 Hours

Lifetime Dimmable Backlit Mirror Harmony 85 X 40

1 hour a day is 44 years.

@dan1888 Would you be able to recommend some brands that has proven LED lifespan? Most of my LED light fixtures had failed way before their claimed service life.. thanks!

This 60"x 36" Led Bathroom Mirror costs $200 bucks. Put $10/year in your savings account and you'll have enough to pay for a replacement when it fails.

I think you also have to find a source that has a good level of dimmable lumen output. Amazon.com: Keonjinn 42 x 36 Inch LED Bathroom Mirror with Lights, Bighter Frontlit & Backlit Vanity Mirror with Stepless Dimmable 3-Color, Anti-Fog Mirror for Wall, HD Tempered Glass, Memory Founction, CR90+ : Home & Kitchen

Amazon Best Sellers: Best Wall-Mounted Vanity Mirrors

Electric Mirror has dimmable LED lighted mirrors with replaceable LED "bulbs." Their Integrity model is available in many different sizes, including 60"W X 36"H. The price is about $1700-ish. This model is forward-lighting. Some of their mirrors, such as the Silhouette model, give backlighting.