Couldn't edit my previous post but this is from pro-products website in regards to the life expectancy:
"Pro Heat™ Radiant Panels are made in the USA and are covered with a lifetime warranty on the housing, 10 year warranty on the heating element and have an expected service life of 50+ years as backed by independent university studies and a proven track record of consumer satisfaction for more than 30 years."
So my T12 is running a pro products PH-3 65 watt and it works fine but outside temps here don't drop too low. If your house gets a bit colder during the winter, I'd suggest a longer RHP just to keep the ambient air temps and then using heat tape as a hot spot.
From what I'm told, pro-products is very helpful and knowledgeable when it comes to RHPs so I'd just contact them directly and ask.
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