Ballasts Tested for DC Operation:

Ballasts are tested in our NY manufacturing facility for effective operation from 320VDC to 410VDC. Ballasts are failed due to improper operation, flicker, excessive heat, or failure to operate reliably. Once a ballast passes our preliminary testing, the ballast manufacturer is asked to complete the testing and submit results to UL. We are constantly testing new ballasts and we expect 90% of universal voltage ballasts to pass. If you would like to have a ballast tested, please contact us.

Ballasts fully tested and UL approved for DC operation:

Sylvania Osram

QHE 4X32T8/UNV ISN-SC
QHE 3X32T8/UNV ISN-SC
QHE 2X32T8/UNV ISN-SC
QHE 1X32T8/UNV ISN-SC

See UL test results (PDF file)

Ballasts tested in our facility, passed.

Advance 1ZT-2S32 Dimming Ballast: Test OK - Including dimming.
Advance 1ZT-4S32 Dimming Ballast: Test OK - Including dimming

Ballast tested in our facility, failed.

Triad Ballast (Made by Universal Lighting Technologies)
2-Lamp: B232I277RH-A  Result: Flicker
4-Lamp:  B432I277RH-A   Result: Flicker

Advance ICF-2S26-HI-LD 120-277V.
Result: flickered at 380VDC (but not at 324VDC) was the