LED fluorescent in existing amaturen

Can I use an LED fluorescent in regular fluorescent fixtures?

Yes this is possible. Both with LED starter and without.
If you have a fluorescent fixture with starter, you can still use the fixture without conversion.
You simply replace the old starter with a LED starter and insert the LED fluorescent and voila done.
However, want to save even more on your consumption? Switch off your ballast by bridging. Then you won't need the led starter and you'll quickly save 10w per ballast.
The LED fluorescent should then be connected along 1 can. This is shown with scheme on the LED fluorescent itself.