The Lexus RX400h dome light requires a DE3175 bulb size for the interior lighting system. Data for the specific component covers the range from 2006 through 2008.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Lexus RX400h uses the DE3175 bulb across all dome light positions for the 2006-2008 model years.
The DE3175 is a festoon-type bulb, meaning it is cylindrical in shape and makes electrical contact through metal caps at each end rather than through a base socket.
The DE3175 operates at 12 volts, which is consistent with standard automotive electrical systems.
The DE3175 has a 31mm length, which is the span between its two end-cap contacts and determines physical fitment within the dome light housing.
The DE3175 designation follows ANSI standards applicable in the United States and Canada, indicating a standardized specification for voltage, size, and contact type.
The front dome light and rear dome light on the RX400h both take the same DE3175 bulb across the 2006-2008 model years, meaning a single bulb type serves multiple interior lighting positions on this vehicle.