LED / T5 Hybrid

[X-37B]

Based on your experiences, how often the T5 will need to be replaced?
I just setup a 4X T5 hybrid with 3X XR15 and running the T5 for 6 hours.
Thank you

I replace t5' once a year when running them. Buy a bulb every couple months to spread out the cost works well.

 

[The Opinionated Reefer]

You can get 18months out of the T5 tubes in a ATI sunpower unit. Iv used them for over two years at one point and they were still growing acropora. Changing the bulbs every 6 to 8 months is not required imo.