I use these, they have a great reflector on them, and they seem really durable. They also carry a lot of different sizes.
https://www.amazon.com/Sunblaster-904296-NanoTech-Fixture-Reflector/dp/B00AKKUBDQ/ref=sr_1_7?ie=UTF8&qid=1477617011&sr=8-7&keywords=t5+fixture