Alternate Lamp for the Source Four HID

The Source Four HID ships with the Philips CDM lamp, a 150 watt, 3000ºK color temperature lamp. The part number for this lamp is RT157.

We now also offer the Philips CDM, 150 watt, 4000ºK color temperature lamp. The part number for this lamp is RT158.

NOTE: By replacing the HID ballast and end cap, Source Four HID 120v can be retrofitted with a S4WRD LED kit. As of November 2025, there is no 277v S4WRD retrofit.