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The 921 LED Reverse Light Bulb Study

Discussion in 'Lighting' started by crashnburn80, May 6, 2017.

  1. May 13, 2018 at 12:50 AM
    #81
    crashnburn80

    crashnburn80 [OP] Vehicle Design Engineer

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    Go Hawks!
    Not those! Not good would be the answer.

    In looking for high power LED reverse lights, you want fewer higher power chips. Many smaller low power chips is an older and much lower output design. See this post here for the reverse lights you linked:
    https://www.tacomaworld.com/threads/led-lighting-conversion.436865/page-141#post-17816879

    These are the JDMs I was talking about:
    https://www.amazon.com/JDM-ASTAR-Ex...D=51zIu2zFzDL&preST=_SY300_QL70_&dpSrc=detail
     
  2. May 15, 2018 at 1:29 PM
    #82
    [kiesster]

    [kiesster] Be water, my friend.

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    Thank you for the link showing that comparison. I ordered the set from your link and will report back when installed. Thanks again for the information.
     
    crashnburn80 [OP] likes this.
  3. Sep 17, 2018 at 3:04 PM
    #83
    deAutoLED.com

    deAutoLED.com Well-Known Member Vendor

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    Thanks for the review and allowing us to participate.

    Please everyone interested in purchasing our reverse use code "REV20" FOR 20% OFF - they will run this code for awhile.

    LISTING:
    http://deautokey.com/product/bright-15-chip-reverse-leds-194-921-wedge-error-free-fits-toyota-tacoma


    We feel these are the brightest in terms of light spread - this spreads light far/wide vs many on the market
    -Color is clean white and not yellow
    -NO modifications required - simple plug and play
    -Error Free

    We feel this places light where you need it: far on sides so others can easily see you - the photo in the bottom shows how much light is shining on top/bottom where others can easily spot it. You can also see a lot of light behind you where you need it.
    We always felt any light beyond this point is not helpful as you are only going to be looking where you are reversing. You don't need light spread 30 feet away as you are only going to be looking 10-15 feet at a time. We find this important to have more concentrated light 10-15 feet.

    We have many happy customers running this setup so we hope you give us a try:

    [​IMG]
    [​IMG]
     
  4. Oct 1, 2018 at 2:50 PM
    #84
    kalaukoa

    kalaukoa Well-Known Member

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    I have a pair of the DeAutoLED reverse lights, and I really like them. The light output is amazing. After reading the reverse light thread by #crashnburn80 , I bought the GY6 HIR bulbs. I got one of them installed and ended up breaking the prongs on the other bulb. The LEDs were plug and play which really appeals to me. Buying an expensive bulb only to have it break while trying to modify it to fit is a bummer. #DeAutoLED has great customer service and a lifetime warranty.
     
    Muddinfun, deAutoLED.com and Norton like this.
  5. Oct 1, 2018 at 3:06 PM
    #85
    deAutoLED.com

    deAutoLED.com Well-Known Member Vendor

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    Thank you for the feedback. We had many people contact us and said they switched from the HIR bulbs to our LEDs because of the install process and because they are too yellow. We feel the brighter clean white light and brightness outweighs the bit more brightness you achieve from the HIR so it is up to the consumer at the end and that is fine but wanted to share some feedback we received through email and much is like what you are saying: -easier install plug and play -no errors -bright white vs yellow light

    Thank you for taking the time to leave your feedback we do appreciate it.
     
    Last edited: Oct 1, 2018
    kalaukoa and Muddinfun like this.
  6. Dec 12, 2018 at 11:35 PM
    #86
    Clay7160

    Clay7160 Well-Known Member

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    GYEON ceramic coating
    crashnburn80 [OP] likes this.
  7. Dec 13, 2018 at 7:13 AM
    #87
    crashnburn80

    crashnburn80 [OP] Vehicle Design Engineer

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    I did not try those but they have a similar rear facing reflector based design as Philips and are rated at the same output, though the XD bulbs have a slightly lower (better) color temp at 5500k vs 6000k.

    I’ve spoken with Steve on the phone a few times, very upstanding nice guy.
     
    Clay7160 likes this.
  8. Mar 8, 2019 at 12:13 AM
    #88
    NMTrailRider

    NMTrailRider Well-Known Member

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    DCTiller likes this.
  9. Aug 28, 2019 at 8:15 AM
    #89
    cytherian

    cytherian Member

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    @crashnburn80 , thanks so much for this highly detailed writeup on 921 bulb substitutes. I actually came here because of that review.

    Just one concern though. I haven't yet found anything mentioned about heat build-up with the OSRAM 615905 35W 12V GY6.35. Clearly 35W from an incandescent / halogen bulb must produce some serious heat. So it does beg the question of how much heat tolerance does the 921 taillight socket have with a bulb like this. Granted, the reverse lights are usually not used for more than 20~30 seconds at a time (maybe closer to a minute in some cases). But, if heat generation is hot enough, it may cause a very slight amount of softening to the plastic in the housing... that upon repeated enough times could cause a noticeable deformity and possibly circuit failure. I once had a car where something like this happened, but in a different scenario. It was the license plate lights and the light unit (combined with release button), somehow didn't have sufficient heat venting. After 5 years, the unit had been exposed to enough heat that it melted and caused a complete failure of the license plate lights. Of course, this is a lower intensity bulb and it was on for at times several hours during nighttime driving. But, it demonstrates that it's plausible for light bulb socket mount plastic to deform from sufficient heat exposure.

    So my main question is -- has anyone here who installed these 35W halogen bulbs done any kind of heat tolerance test? For example, putting vehicle transmission in reverse, engaging the emergency brake, then going to the rear and hand-sensing heat from the taillight? And better yet, partially taking out the taillight unit bulb holder where it's still connected but easy access to bulbs, and after running reverse lights for about a full minute, remove the bulb carefully (e.g. use towel or glove) then check the housing to see if it's warm or too hot to touch.

    (FWIW, it's only summertime when I occasionally run into scenarios where much brighter reverse lights are desired. So, I have been tempted to just go with a good quality LED replacement that puts out around 500 ~ 800 lumens... still about double or more than cheap incandescent 921 bulbs. Still, for about the same price to have a whopping 1200+ lumens per bulb with the OSRAM is tempting, as long as heat management is fair.).
     
  10. Aug 29, 2019 at 6:40 PM
    #90
    crashnburn80

    crashnburn80 [OP] Vehicle Design Engineer

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    Heat resistance testing is covered in the HIR thread, they are safe in a 2nd Gen Tacoma tail light:
    https://www.tacomaworld.com/threads/gy6-35-hir-921-reverse-light-upgrade-vs-high-power-leds.474996/

    I put the truck in reverse and set the parking brake and had it sit for 20-30min and took IR temp readings with the HIRs, the details are in the above thread. I've also had to back out of hairy tight trails for nearly that same amount of time with no ill effects on the reverse lights for a 2nd Gen Tacoma. In my girls Ecoboost Escape which has very small reverse light housings, I run the 30w Philips HIRs. Haven't done a 30 minute test on them in the small housing, but the Escape is not going to be getting into situations where it is backing up for 30+ min like I am likely to do in the Tacoma.
     
    stbear likes this.
  11. Sep 23, 2019 at 11:56 PM
    #91
    lechicklet

    lechicklet Well-Known Member

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    The 20% off code is still good btw =]

    And thanks for the super thorough review @crashnburn80! There are sooooooo many bulbs out there, and I’m pretty skeptical with online store reviews, it just became overwhelming. Your information gave me the info I needed to make an educated decision. I appreciate the extensive testing and detailed reports!
     
    stbear and crashnburn80 [OP] like this.
  12. Nov 11, 2019 at 11:21 AM
    #92
    cytherian

    cytherian Member

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    Thanks for the verification. I validated it myself with the bulbs installed and there's no appreciable heat build-up. I'm VERY glad I went this route, rather than overpaying for LED's that will do a similar job.

    In order to get a proper fit, I bent the prongs using 2 pliers to ensure the glass receives ZERO stress (to avoid any cracking). This is the shape I achieved that worked well for my application:
    [​IMG]
     
    crashnburn80 [OP] likes this.
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