Diode issue with H4 LED bulb - Unofficial Honda FIT Forums

Fit Interior & Exterior Illumination Threads discussing interior and exterior lighting modifications for the Fit/Jazz

Thread Tools Search this Thread
Old 04-02-2017, 08:03 PM
5 Year Member
Thread Starter
Join Date: Aug 2009
Location: Singapore
Posts: 33
Diode issue with H4 LED bulb

I've tried 2 sets of no name LEDs, but each time I notice a partial yellow cast/tint on the wall/vehicle in front of me.

And after looking at the bulbs up close, my hypothesis is that the cheaper bulbs have diodes that are, well, bigger than the area of the filament (halogen) and the yellow tint is actually reflected off the diode base.

Am I correct to say so? If not, is it just an issue of headlight leveling?
Reply With Quote
Old 04-02-2017, 11:11 PM
Join Date: Aug 2012
Location: Vermont, USA
Posts: 1,172
Are you talking about the color of the light in general, or the pattern of the light?

The color of the light is inherent in the LEDs. It shouldn't change much if any with angle. The pattern using any LED headlight bulb is going to be bad because the light pattern produced by the bulb is wildly different from a real halogen bulb and not in the designed focus position for the headlight reflector. That's why LED bulb replacements, at least those sold in the USA, are marked for off-road use only and not legal for street use. (These laws are not always enforced very well, rather to my dismay at times.)

You would not see much if any coloration from reflections from the LEDs. Their yellow color is, I suspect, due to the phosphor on the white LED chips. White LEDs are generally blue LEDs with a phosphor that absorbs some of the blue light and emits yellow-green light that, when combined with the remaining blue light, gives something sort of like white light. (LEDs are inherently monochromatic light sources so cannot produce white light directly.)
Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
What Is The Best Halogen Headlight Bulb? Mikeyk12 2nd Generation (GE 08-13) 47 08-31-2015 12:48 PM
2015 Fit CVT Shifter Bulb Replacement? Renbo 3rd Generation (2015+) 0 05-14-2015 04:20 PM
Xenon White LED Fog Lights.. IQBALLK Fit Interior & Exterior Illumination 1 05-08-2015 09:23 PM
Bad ignition coil or just boot and spring? doctor J 1st Generation (GD 01-08) 4 05-08-2015 12:06 AM
Outfitting 2012 Fit for towing behind motorhome AC7880 2nd Generation (GE 08-13) 3 08-18-2012 10:15 PM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -4. The time now is 12:02 PM.