Does switching from CFL's to HPS cause stress on plants?

[mangosnapper]

I have made me a CFL cluster light...and for the most part it works. But the Temps dropped drastically where I live
so I fired up my HPS light to offset that. It worked for the temp concern... But I was wondering if it can stress a plant switching the lights...I don't have a MH blue bulb... money is tight right now, ya' Know!!!!

 

[cannasensei]

I've never had an issue, As long as temps and humidity are proper. If not, cut the bottom off a water bottle and place the top over the plant for a few days.

 

[KarlJay]

I vegged with CFL/T8 then switch to flower and got HPS lights, had no problem at all.

It might depend on how mature your plants are, if they are young, you might stress them, but if they are healthy, you should have no problems.

 

[Fuzzy Duck]

I use a 125w gaint cfl for veg & flip straight to a 400w hps for flowering with out a problem.

The only thing i do is start the 400w at 20" above the plants and slowly decrease hanging height over the first week to aprox 12" to 14" to custumize plants to new light

 

[OregonMist]

Fuzzy Duck got it on the head, raise your hps a little then slowly lower it over a week, you should be fine.