400w to 600w ????

Can anyone confirm if I change from a 400w hps "power plant" bulb to a sun master 600w can I expect a significant yield increase

Absolutely, more light will increase yield.

regards,

do you plan on getting a 600w ballast to power your 600w bulb?

smoke and coke said:

do you plan on getting a 600w ballast to power your 600w bulb?

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I would assume he would have to.

regards,

Unless hes got a switchable ballast correct?