T5 replacement procedure

[kriv4o]

I've had the bulbs in my 4 bulb fixture for about 8 months now and I already got a replacement set. I was wondering what the best approach swamping the new with the old ones would be.
Based on what I've read on here I came up with two scenarios:
1. Switch all four bulbs at the same time, cut my light schedule in half and slowly increase the light period over a period of about 4 weeks to avoid stressing my corals.
2. Leave the light period constant and swap a bulb per week or 10 days to achieve the same effect - less stress on the corals.

Forgot to say that currently I have a Coralife 4bulb fixture running the stock bulbs and the bulbs going in are 2 ATI Blue+, ATI Purple + and ATI Aquablue Special.
Thanks ahead of time:spin3:

 

[TimeConsumer]

I usually just swap them all and don't change a thing. Never had anything bad happen.

 

[Donkeykong]

I would change out one every 5 days or so. IF you want to change them all out at once you can get some screen mesh that can be placed in layers inbetween the lights and tank, then you can remove one layer every couple of days. The key is just try to spread out the change so you dont have a huge jump of light all at once.

Timeconsumer, yes it is possible to just change everything out all at once and not have any problems. But without knowing exactly what his setup is and what type of corals and coral placement he has I personally would not recommend this to him.

 

[kriv4o]

Thanks a lot guys