H8 LED fog lamp bulbs - Hyundai Sonata Forum
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post #1 of 27 Old 09-22-2014, 02:03 PM Thread Starter
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H8 LED fog lamp bulbs

Just upgraded to 4300K HIDS (Xenon Supply) and now my halogen fogs look yellow.

Does anyone have advice on purchasing LED replacements for H8 fogs? I was looking at the Stage 2 5000K cree LED from K5 Optima store but not sure how good they are.

Thanks in advance.
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post #2 of 27 Old 10-02-2014, 09:14 AM
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I use a bulb like that in my fog lights, and I have been very pleased with them. You can see that they are just a wee bit "whiter" than the the 4300K HID low beams.

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post #3 of 27 Old 10-03-2014, 12:20 PM
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Check out this video before purchasing LED fog light replacements

Our XML2 H8 LED Fog lights produce 1,420 lumens (measured) and will be significantly brighter than the ones OP posted.

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post #4 of 27 Old 10-04-2014, 11:15 PM Thread Starter
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Quote:
Originally Posted by Diode Dynamics View Post
Good vs. Bad LED Bulbs: Testing Current - YouTube

Check out this video before purchasing LED fog light replacements

Our XML2 H8 LED Fog lights produce 1,420 lumens (measured) and will be significantly brighter than the ones OP posted.

Nick C.
Nick, I have seen your XML2 versions and was very tempted to get them. I tinker a lot with LEDs and know how much the XML2's can crank out. Two things were keeping me from pulling the trigger (1) budget, as there are other upgrades I have planned (both lighting and appearance), and (2) I wanted a slightly warmer (5000K) tint so as not to look too cool compared to my HIDs. I am also working on a custom pair of LED DRLs consisting of 6 x 5000K XMLs each. Thus, I want the fogs to match those as well.

I ended up ordering the 5000K H8 bulbs from K5Optima store as it was a good fit with both my budget and the tint I was interested in. I had several emails with the owner (David) who was very helpful and expressed that he has had many satisfied customers who have purchased those fog bulbs. They should be in next week and I'll post a follow up once they are installed.

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Originally Posted by RHF View Post
I use a bulb like that in my fog lights, and I have been very pleased with them. You can see that they are just a wee bit "whiter" than the the 4300K HID low beams.
Thanks for the pic. They are a good match with your HIDs. That's the look I am going for.

Last edited by Hill; 10-04-2014 at 11:18 PM.
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post #5 of 27 Old 10-06-2014, 11:26 AM
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We will be introducing 4300K and 5000K versions of the XML2 within the next few weeks. The XML2 is currently available in 6000K only.

The LED bulbs that we cross-tested in that video posted above were from K5Optima store

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post #6 of 27 Old 10-09-2014, 10:19 PM Thread Starter
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We will be introducing 4300K and 5000K versions of the XML2 within the next few weeks. The XML2 is currently available in 6000K only.

The LED bulbs that we cross-tested in that video posted above were from K5Optima store

Nick C.
Thanks Nick. I prefer those warmer tints over the cooler 6000K version. The 4300K would be a perfect match for my HIDs too.

I checked out your video and was surprised to see the sharp drop in current from the H8 bulb you say was from K5Optima store. I performed my own bench test and, although the current did drop over time, it was not as rapid nor go as low.

My bench test was set up as follows (see pic below for reference)
  1. Current and volts were measured using a digital volt/ammeter.
  2. Power was supplied by 3 x LiMn batteries in series charged to full capacity (4.2V each)
  3. Light output was determined by a lux meter and readings were taken with the meter probe place in such a way as to capture the indirect light from the bulb (also known by hobbyist as "ceiling bounce). An integrated sphere is really the proper device to use for accurate light output, but this was the best I had. Thus, lux readings are just meant to be a relative comparison of output change over time.

Test Results (see graphs below)
I took measurements at the very start (time 0) and every minute for the first 10 minutes, then at 5 minute intervals up to 30 minutes, at which time the test was terminated.

As you can see, current starts at ~800 mA, then steadily drops to ~500 mA during the first 10 minutes at which point it stabilized until the end. Voltage sag was minimal (12.2V starting to 11.9V ending), so the drop in current was most likely due to heat build up and not voltage drop.

The lux readings dropped with current (as expected), but did stabilized once the current settled down to ~500 mA.

Overall, this appears to have performed well, given the high number of Cree XBD emitters (16) and relatively minimal heat sinking. I don't think much can be improved on this, except using a more efficient emitter (XML or XPL) and perhaps more mass for heat sinking. However, unless the heat can be removed, once the unit heats up, current sag will prevail as there is no place for the heat to go. This is really a case of striking a balance between output and minimizing heat build up, much of which is controlled by the electronics.
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post #7 of 27 Old 10-09-2014, 10:43 PM Thread Starter
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Here are some photos of the 5000K H8 LED bulb I used and after I installed them. I took photos both during the day and at night.
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post #8 of 27 Old 01-03-2015, 06:48 PM
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Great look from a brightness standpoint but the fog lights won't do their job properly. A fog light must have a very specific cutoff point in order to stay "under" the fog. I ran into this issue when trying to find a quality replacement bulb for my 2013 Genesis.

Fog lights are low-mounted lights (bumper level or below) that project light that's cut off at the top. So the light pattern on a good-quality fog light goes straight out at bumper level and down, but not higher than that.

From the photos it looks as if the replacement bulb is causing a star burst effect, which in return would bounce off the fog and reduce your visibility.

Still a great looking LED though =)
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post #9 of 27 Old 01-16-2015, 09:57 AM
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Fog light LEDs

Quote:
Originally Posted by RHF View Post
I use a bulb like that in my fog lights, and I have been very pleased with them. You can see that they are just a wee bit "whiter" than the the 4300K HID low beams.

Tried them, didn't like them. Cool look but the light scatters too much, no real illumination effect. The LEDs were sold with a claim of 4000 lumens, read the fine print, that dropped to 2000 per light. Wasted $100. I have more effective lighting with my 5000K hid lights, personal preference though. Headlights are 5000K 35W fog/low and 5000K 55W fast start high beams.
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post #10 of 27 Old 01-16-2015, 11:27 AM
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A "claim" of 4000 lumens for plug and play LED replacements should have been your biggest concern. Even 2000 lumens is a gross overestimation of the actual light output under normal operating conditions.

That's why you should always look at the lumen numbers to see if the vendor says calculated, estimated etc....A good provider will have real measurements, and make their measuring process available for customers to see.

It's frustrating that the lighting industry has such low standards. I get tired of seeing people get taken advantage of.

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