Diode Dynamics 39mm SMF4 LED (single)
39mm SMF4 is a direct replacement for any 36-40mm size halogen festoon bulb.
By changing the factory bulb to an LED, you can illuminate the area with a much brighter light, and add a pure white, luxury look.
The installation is 100% plug-and-play, just replace your factory bulb.
This bulb is a 39mm festoon bulb, but can fit in varying applications. It is made up of four SMD chips, in a durable metal case. You will not find a brighter LED bulb for this application! A load resistor is embedded to prevent blowing the LED from voltage surge, and a diode is implanted to protect the LED from reverse polarity. The LED is wired for 12V operation, the kind found on all vehicles.
Included in your order is ONE BULB.
These LEDs are available in crisp, bright colors including Cool White, Warm White, Blue, Red, Amber, and Green.
We strongly recommend cool white or warm white for the best visibility.
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