Backup LEDs for 2015-2016 Subaru WRX (pair) – XP50

Notice: This bulb (921) is for the WRX Sedan. The WRX Wagon uses a 7440.

BULB DESIGN

HP5: Four high-power SMDs, under a diffusing lens. Just like the HP3, but run at higher power, with integrated copper plating for superior heat dissipation, allowing maximum brightness.

HP36: Full 360 degree illumination with 36 High-Power Samsung LEDs. Aluminum base for optimum heatsinking, and non-polar design for easy installation.

XP50: Each of the four sides of this bulb contains two 5W-rated chips, and the top is fitted with two more under a projector lens. Housed in an aluminum casing with textured finish for maximum heatsinking properties.

Fitment. All three bulbs use a quality inject-molded 921 terminal, with a sturdy base connector and proper pin alignment, designed for exact replacement of your factory 921 bulb. You will not need resistors for backup lights. Just replace the factory bulb.

Included in your order is TWO BULBS.

COLOR

These LEDs illuminate in a crisp, cool, bright, white hue for maximum light output.

BRIGHTNESS

Diode Dynamics offers several brightness options so you can choose what fits you best. These options are listed by the design and the lumen output of each bulb:

HP5: Slightly lower brightness than OEM bulbs, but still provides the crisp, modern instant on/off of LED technology.
HP36: Slightly higher brightness than OEM bulbs.
XP50: Much brighter than OEM bulbs. These are bright!

Lumens. BUYER BEWARE! Most sellers just provide “calculated” lumen numbers, based on the maximum potential brightness of the LED chips on the bulb. For example, if a bulb has five 10-lumen chips, they will rate it at 50 lumens. However, this is not accurate, as the design of an LED bulb does not get rid of heat fast enough to run the LEDs at maximum.

These “calculated” lumen ratings are much, much higher than the true, measured light output, so it will look like competitors’ bulbs are brighter than ours. This is because Diode Dynamics does not provide inflated “calculated” numbers; we believe it is misleading. We test the actual brightness of the bulbs in our lab, to provide real lumen output measurements. Our measurements are accurate, but they are usually much lower than the misleading “calculated” figures. Please click here to learn more about LED brightness measurement.