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What are D3S and D4S type HID bulbs?

April 26, 2017bulbs d3s HID type

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What are D3S and D4S type HID bulbs?

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D3x and D4x are mercury free versions of the D1x and D2x light sources. They do not work with older D1x/D2x type ballasts because steady on voltage is only 36 V. Compare that to a D1x/D2x style, and u will see that voltage is 85 V. In detail, 42 +/- 9 V can be measured at a D3x/D4x bulb.