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Old 07-17-2014, 01:45 PM   #11
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White LED temperature chart:

It is really hard sometime to describe what color or temperature a white LED is. So I have posted a couple of photos that might help everyone out. As a point of reference an incandescent bulb (like the 921 automotive bulb) will be in the 2800K temp range. I hope this helps!
Jeremy B.
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led-color-temperature_jpg_cf.jpg   color_temp_jpg.jpg  
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Old 07-17-2014, 02:03 PM   #12
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Thanks. I'm looking into doing this mod myself. I have been looking around and found these LEDs below, but I can't figure out what the difference is between the two products or which one I need. Any help?

http://www.amazon.com/24-3528-Bulb-S...pr_product_top

http://www.amazon.com/GRV-24-3528-Su...FZA9Z2KH3WKDQE
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Old 07-17-2014, 02:16 PM   #13
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Originally Posted by SkyBound View Post
Thanks. I'm looking into doing this mod myself. I have been looking around and found these LEDs below, but I can't figure out what the difference is between the two products or which one I need. Any help?

http://www.amazon.com/24-3528-Bulb-S...pr_product_top

http://www.amazon.com/GRV-24-3528-Su...FZA9Z2KH3WKDQE
Being that I have not used these I can't say if they are good or bad other than based on the information that Amazon has provided.

The first one is not a good one based on the fact of the low Lumens (how bright) that one is (95-100 lumens). It is less than half as bright as a 921 bulb.

The second one they don't give a Lumens number but people are commenting that they thought it was about as bright or close to the ouput of the 921 bulb.

Personally I would stay away from any LED replacement unless they specifically give you an Lumens number. And if they do, I would get something that was 220 or higher. Then it's just a matter of which tempature of white you prefer.
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Old 07-17-2014, 03:57 PM   #14
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Being the first LED attempt didn’t go so well, I worked on finding another LED option. I found one on Ebay and they arrived yesterday. These replacements are LED panels with three different plug-in attachments. They are a little “hotter” than a warm white LED but they are real close and they have a lumens of 280 which is real close to the same amount of light that the 921 bulb emits. So after installing these in one of my interior lights, I was extremely pleased with the amount of light and the “color/temp” of the white LED.

Jeremy B.
Hmmm... I was asking about a different led replacement bulb

and in that thread, it was mentioned that a panel with 48 leds would be needed to achieve the lumen output of a 921. Are these really that close to the output of a 921 with only 20 leds?

Second question - did you replace your tail/stop/turn lights, or just the markers?
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Old 07-17-2014, 04:44 PM   #15
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From the research I have done it is easy to obtain the same lumens as a 921 with a 20 LED bulb. In fact, the more expensive ones are brighter (>300 lumens) with 20 LEDs.

I just ordered 20 replacement LED bulbs for less than 50 dollars and they are apparently 90% as bright as the original 921s. I don't like bright lights anyway, and for the price you can't go wrong.
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Old 07-17-2014, 08:22 PM   #16
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Hmmm... I was asking about a different led replacement bulb

and in that thread, it was mentioned that a panel with 48 leds would be needed to achieve the lumen output of a 921. Are these really that close to the output of a 921 with only 20 leds?

Second question - did you replace your tail/stop/turn lights, or just the markers?
You don't necessarily need 48 LED's to get the lumen output of a 921 bulb. It depends on the size of the LED. It's like trying to get the same light output from one mini-light bulb from a string of Christmas lights to equal the output of a 60W light bulb. Yes you can get the same output but it takes a lot of the mini-bulbs to get there. Same is true with LED's. So yes 20 LED's of (5050 size) could match the output of 48 LED's of (3528 size). If you get the one from Amazon let me know how they work. If they truly are 410 lumen each (I would ask them) that would almost be twice as bright as a 921 bulb.

No I haven't done my tail/stop/turn lights yet. I haven't found any that was comparable to the ones offered Command Electronics. I think I may need to bite the bullet and just pay the $58.00 (includes shipping and sales tax). Besides this is a safety item and I would sure hate for it not to work while I was traveling.
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Old 07-17-2014, 09:34 PM   #17
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For the price, I went ahead and pulled the trigger. If they are not what I expected, I can always return them and pay a modest restocking fee.

So there is no single bulb LED replacement for the tail/stop/turn lights?
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Old 07-18-2014, 06:38 AM   #18
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Thanks for the source on the clearance light LEDs. Were the lens hard to pop off?

Mine have dirt / water leaking into them and I might as well replace the bulbs when I get around to cleaning them.
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Old 07-18-2014, 06:55 AM   #19
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So there is no single bulb LED replacement for the tail/stop/turn lights?
Its pretty hard to get adequate lighting out of a replacement LED bulb. Regular light housings are designed to reflect a halogen bulb, which throws out equal lighting in a 360 degree pattern. LED's are directional and throw light in a smaller and more focused beam.

For the best light output without wasting power, you want LED's in a specifically designed housing with appropriate optics. It is more money to buy, but the output is incredible.

My father-in-law has an Avenger with the standard halogen Bargman style lights. The "reflector" is more or less a flat piece of shiny metal heat shield. One light appears much brighter than the other. On my old RV, I replaced my Bargman light with a generic trailer LED stop/turn/tail from Harbor Freight tools. The lights are VERY bright and can be seen day or night. I'm one of those guys that drives with lights on all the time. When we camp in a group and caravan together, it is very easy for people to find me because my taillights are so bright.
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Old 07-18-2014, 07:59 AM   #20
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Thanks for the source on the clearance light LEDs. Were the lens hard to pop off?

Mine have dirt / water leaking into them and I might as well replace the bulbs when I get around to cleaning them.
No problem! My HTT is brand new so they weren't hard to take off. Just use a large standard screw driver on the ends (there is a small slot in the middle) to pop the lenses off. Mine were a little difficult because they got caulk in the seams and then pressed the lenses on thus almost gluing the lenses on.

BYW Threebutchers very nice mods and gear section that you have put together.
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