When to switch from MH to HPS

[rory]

Just bought 600W light system that comes with both MH and HPS bulbs. I started with MH and need to know when to switch to HPS. Any suggestions?

 

[415friendly]

After the stretch is over... from what I understand, the red and yellow part of the spectrum (which HPS has more of) promotes even greater stretch.

 

[rory]

Thanks for the reply. I'm still learning..."after the stretch" means how much time?

 

[415friendly]

To be honest, I don't have a firm understanding of when the vertical stretch stops because I really feel that it's strain and environment dependent. You'll be able to tell when the plant stops growing vertically and starts putting more energy into flower production.

 

[rory]

Thanks...that makes sense. That means it's time to switch the Dark Angel.

 

[bordengrow]

I swap bulbs when I start my flowering phase

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[rory]

I'm using both right now [have other hps in room ]. Have a few plants started late so under mh to catch up, then switch to full hps when ready to flower. Thanks for the help.

 

[pooloss]

I've heard running the HPS with the MH gives good results as well.

 

[Legal80]

If you have a tall strain and limited space it would help to avoid as much stretching if you had MH on for first few weeks of flower. Then switch to HPS.