We have two 'light bars' in our kitchen, each with 4 GU10 Halogen bulbs. I fitted the light bars because I was worried about the heat and intumescent covers required for downlighters. The heat emitted from the halogen bulbs was immense - I was concerned about the heat affecting the wiring. The bulbs also 'blew' regularly, about one every month. Along came the LED replacements (bought off
Ebay initially) and they are great, with little heat output, and the light is good. After about 7 years, only 2 have failed, and they are very cheap to replace.
Recently, a fluorescent batten failed in the garage, and switching tubes around proved it was the ballast inside the unit rather than the tube.
I sourced a new tube from our local wholesalers - he was very helpful and suggested a tube that only requires wiring to one end and works off mains with no ballast. It was very simple to wire in (even for a colour-blind numpty like me), and the difference in light output is astonishing.
I've kept the old fluorescent tube as a spare, but am tempted to change some of the other lights to LED.