New Grower Light

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Hello. Do i need ballast for 70 or 100 w HPS ? I used 90w mhl
In last time (whit no ballast)
 
As far as i'm aware all hid lights need a ballast, some can come with a built in ballast but that makes them quite heavy. Try ebay you should pick up for decent money
 
For hps lights you need a really high voltage at the start, far more than 230V or 120V that means that you need a ballast.
Cheers
 
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