70W  electronic HID ballast features and advantage:

Superior color uniformity

Low profile, lightweight cases

Excellent lumen maintenance

Integrated thermal protection

Approved for recessed use

Constant lumen output over a wide input voltage range and lamp voltage variation

Significant energy savings when compared to magnetic ballasts

Saftey Shutdown features, End of lamp life protection

Superior hot lamp restrike characteristics

Designed, tested, & approved for most lamp brands

Low voltage lamp shutdown