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ballast output

I am wondering about the voltage output of lighting ballasts.  In the 
past, I was convinced that 40W ballasts were step-up transformers and 
ran in the KV range, so I built my DIY lighting hoods accordingly (heavy 
insulation, etc).  I am not convinced of this anymore (based on wattage 
output and current draw) and was wondering if anyone knows for sure what 
voltage standard ballasts run at.  


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