Arduino and Sprinkler System Solenoids

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hi there,

i have been reading lot on controlling solenoids playground , various websites.

my solenoids need power has following specification:

• solenoid: 24 v ac
• inrush volt-amp: 24 v ac-11.50 va
• inrush current: .4 amp
• holding volt-amp: 24 v ac-5.75 va
• holding current: .2 amp

is still advisable make use of separate 24v ac psu , use opto-couplers switch solenoids? or using transistors better option?

thanks
john


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