Yes, I did order the RED bulbs and yes, I did do a L/R comparison. Since these bulbs have 6 side-firing LEDs, the brightness from the side is actually better than straight on although neither was dim enough for me to not want to use them. I had the tail end of the car in direct sunlight and yes, the LED version is not quite as bright as the original bulb but it is still recognizable in direct sunlight which is why I'm using them on both sides now. The fact that they are all consistent now with the LED brake lights outweighs the slight decrease in brightness and who knows, maybe someone will come out with one that is even brighter in the future. These are by far, the brightest I've seen yet. The way that they just "snap" on and off looks really cool....

 

One other question: did you have to install the power resistors or does the G35 accept the LEDs with no problems?

<font color=blue>'04 G35S 5AT, Black Obsidian/Willow, Prem/Nav/Sat</font color=blue>

 

You definitely need a resistor. I added one to each rear turn signal bulb. I bought a 2-pack from Radio Shack - 10 ohm, 10 watt for $1.29 and they work fine; just put one on each side across the two wires going to the bulb.

 

Ok, for us that don't quite understand. I can't just buy a 7440 LED and replace my existing turn signal? Exactly what do I have to do? Also, I'm not sure how to replace the rear turn signal. Nothing in the owners manual shows how to (just the sedan).

 

you can buy it and just put it in, but since led's are lower wattage than halogen, the car thinks that the bulbs are burnt out and the bulbs would blink faster.. to prevent this you would need to put resistors to make it blink normal.. I haven't tried it but I know that when I put led's into my last car it blinked pretty fast.. didn't really care so I just left it as is

 

SagiSRP is exactly correct. If you just replace the existing rear 7440 bulb with an LED version, it will blink very fast since the LED does not draw as much current as the regular bulb. This is the car's way of letting you know that a bulb is out. You have to wire the resistor across the wires of the socket so the car "thinks" a normal bulb is plugged in. The only down side is that should the LED burn out (which should never happen), the turn signal will not change blinking rate since the resistor is still installed. As far as changing the bulb, you have to remove the entire taillight assembly on both sides from inside the trunk. Just search this forum for instructions. They've been posted before and there are just 3 nuts to remove once you get at them.

 

so are these LED's worth getting or is the jury still out???
any day night pics or vids??

 

I'm happy with them. I'll post pictures when I've completed the installations.

 

Whoa! Stop! I ordered these lights for the sedan - only to discover that the 7440's in the sedan are positioned straight up, so the main bang from these LEDs also faces up, NOT rearward. LEDs are very directional, so their power can be very reduced if facing the wrong direction.

I was actually surprised that the internal housing of the turn signal assembly provided for a very uniform illumination of the red lens even with this direction problem. I know somebody makes a 90-degree LED bulb, but not sure if it's available in the 7440.

Side-by-side pictures to follow.

<font color=blue>'04 G35S 5AT, Black Obsidian/Willow, Prem/Nav/Sat</font color=blue>

 

This is a pic taken of the back of my garage door being illuminated by the turn signals. Regular incandescent bulb on the left. LED on the right. Used a -2 stop setting on the camera. Notice the central "hot" beam pattern of the regular bulb. I estimate that the LED is 6 dB dimmer in this hot spot, but very similar in the periphery.

<font color=blue>'04 G35S 5AT, Black Obsidian/Willow, Prem/Nav/Sat</font color=blue>

300940-102_0259-low.JPG

 

Same pic setup, but using the flash on the camera to simulate wash-out effect of daylight. Also -2 stop exposure.

<font color=blue>'04 G35S 5AT, Black Obsidian/Willow, Prem/Nav/Sat</font color=blue>

300942-102_0260-low.JPG

 

wow big difference between the stock and LED. BTW, db is a unit of measurement for sound level not light intensity. light level is measured in Cd or lumens.

 

When "dB" is used to indicate an absolute power level, it is actually in reference/comparison to something. In acoustics, the conventional term is really dB (SPL) which is sound level referenced to an established threshold of sound at 1kHz.

More generally, "dB" is a way to logarithmically compare any two "signal" levels, whether sound, voltage, intensity, etc.

Equation: [dB difference] = 10log(level#1/level#2)

I don't have a way to make absolute level measurements (in lumens, etc. as you said), so I used a comparison convention that EEs use and guessed at 6 dB from judgement/experience. This equates to a power (level) difference of 4X. Another way of thinking of this would be to compare a 100W light bulb to a 25W light bulb.

<font color=blue>'04 G35S 5AT, Black Obsidian/Willow, Prem/Nav/Sat</font color=blue>

 

Sorry for the delay but here are some videos of the LED bulbs finally installed, i have also installed LEDs in the clearance and marker lights in the front and rear and have wired them to blink with/opposite the turn signals

check out the videos: they are both day and night, front and rear, with and without the headlights on

please right-click and "save target as..." please do not stream.

if the links go down i will repost a mirror site

http://users.wpi.edu/~dlmason/DF1.mov
http://users.wpi.edu/~dlmason/DF2.mov
http://users.wpi.edu/~dlmason/DR1.mov
http://users.wpi.edu/~dlmason/DR2.mov
http://users.wpi.edu/~dlmason/NF1.mov
http://users.wpi.edu/~dlmason/NR1.mov
http://users.wpi.edu/~dlmason/NR2.mov

NOTE: because of the delay of the CCD chip, the "snapping" effect of the LED bulb is not entirely represented...i assure you, these bulbs come on just like the brake lights do. These vids should give you a good idea of the illumination intensity.

 

Great work! But I'd recommend using a 6ohm, 50 watt resistor as opposed to the 10 ohm/10 watt one you may be using.

How is the light output compared to stock?

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