The Alternating Current series and Dirrect Current series of electronic ballasts for Low Pressure Sodium lamp developed by WRI adopt the SCM CPU digital technique. It insures the intellectual protection of electronic ballasts--- keeping the safety of ballasts and the system , when the voltage output terminal is abnormal. In the process of warm-up, triggering, and- ignition, the CPU can reach the best state to protect the electrode of lamp /tubes. This is measured by the microsecoWRI- controlling span of system and- the height of impulse from the trigger voltage. Thus it doubles the longevity of the electrode for lamp tubes greatly.
WRI's Alternating Current series and Dirrect Current series of electronic ballasts for Low Pressure Sodium Lamps adopt the high frequency output solution (≤30HZ) to eliminate the frequent flashing phenomena caused by low frequency output, and- increase the efficiency of tubes by 10%. Owning to the high frequency output solution to increase ballast efficiency, the consumption caused by ballasts itself is greatly reduced by 4% or so. While in low frequency output the ballast consumption is about 10%; if it is used in the same solar energy system , the efficiency increased by using the high frequency electronic ballasts can reach about 6%, comparing with that of low frequency ones. Thus, it considerably saves the area betaken from the solar energy battery, and- reduces the cost.
WRI's electronic ballasts for Low Pressure Sodium Lamp adopts the optimized designing solution for dynamic operation, the best electronic fittings, the high quality aluminum to dissipate heat, the integrated sealing to proof wet and moisture, all of which insure the traits of high quality, long life and- free of maintenance.
·Content of Electronic Low Pressure Sodium Ballast（Alternating Current series）

Model	Voltage	Power	Dimmable light	Detail
WRI -BAL220AC18W	220	18W	--------	View
WRI -BAL220AC26W	220	26W	--------	View
WRI -BAL220AC35W	220	35W	--------	View
WRI -BAL220AC36W	220	36W	--------	View
WRI -BAL220AC55W	220	55W	--------	View
WRI -BAL220AC90W	220	90W	--------	View
WRI -BAL220AC91W	220	91W	--------	View
WRI -BAL220AC135W	220	135W	--------	View
WRI -BAL220AC180W	220	180W	--------	View
WRI -BAL220AC131W	220	131W	--------	View
WRI -BAL220AC66W	220	66W	--------	View

·Content of Electronic Low Pressure Sodium Ballast（Dirrect Current series）

Model	Voltage	Power	Dimmable light	Detail
WRI -BAL12DC18W	12V	18W	--------	View
WRI -BAL12DC26W	12V	26W	--------	View
WRI -BAL12DC35W	12V	35W	--------	View
WRI -BAL12DC36W	12V	36W	--------	View
WRI -BAL24DC18W	24V	18W	--------	View
WRI -BAL24DC26W	24V	26W	--------	View
WRI -BAL24DC35W	24V	35W	--------	View
WRI -BAL24DC36W	24V	36W	--------	View
WRI -BAL24DC55W	24V	55W	--------	View
WRI -BAL24DC90W	24V	90W	--------	View
WRI -BAL24DC91W	24V	91W	--------	View
WRI -BAL24DC135W	24V	135W	--------	View
WRI -BAL36DC90W	36V	90W	--------	View
WRI -BAL36DC91W	36V	91W	--------	View
WRI -BAL36DC135W	36V	135W	--------	View
WRI -BAL36DC180W	36V	180W	--------	View
WRI -BAL24DC185W	24V	185W	--------	View
WRI -BAL24DC-66W	24V	66 W	--------	View