Important as well is that the best LED grow lights use specific wavelengths of light that are needed the most by your plants. Traditional grow lights blast your plants with light and as a result much of the light is wasted.
1 More than 90 people out of 100 who have a bypass are still alive 5 years after surgery.  How long a bypass lasts depends on how long the blood vessel grafts stay open. The risk of needing another operation gets higher each year after your surgery. After 5 years, about 2 out of 100 people need another surgery.
My surgeon has people who've lasted 25 years and still going strong on the first bypass. But as long as he's a healthy 75, there's no reason why he can't be re-grafted ... i.e. they redo the bypass surgery if they can. Now granted that's going to take some time to recover from, but assuming that's what's wrong it may well give him a good long life.