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Old 04-28-13, 12:26 PM   #46
MaxQ
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Default lumens tell a big part of the story

Harold57 has it right. There is a lot you can predict/estimate about the performance by looking up the specs. Unless the vendor advertises the actual chip(s) and lumens output for their product, it will be hard to know what you are really getting.

When LEDs are manufactured they are ranked according to their brightness. They are categorized into "bins" or "groups" that are designated by letters and numbers. The higher the letter, the more efficient the product. The more efficient (more light per unit power), the more expensive the product. The manufactures are striving to increase efficiency and you'll see higher rankings become available as their manufacturing techniques evolve or they start up a new product line.

From what I can tell, the items with the single LED are based on the CREE XLamp XP series.

a data sheet is here: http://www.led-tech.de/produkt-pdf/cree/XLampXP_B&L.pdf

If you look on page 3 you can see a table of the outputs for the various group codes. The "Q5" and "R5" are currently available in the 7440 packaging used in our backup lights. As you can see they have minimum outputs of 107 and 139 lumen for the conditions tested. This is about 30% brighter for the same power.

Usually the light pattern or beam size is also listed in specs for LEDs and is based on how the LED is packaged. Most LED chip are encased inside a plastic or epoxy package that has a lens molded into it. The lens shape determines the pattern/beam size. Many of the newer high power LEDs do not come with a lens. It is added on by the manufacturer of the end product. Regardless of who provides the lens, the physics are the same. Given the same emitter, the lens can spread the light into a smaller (brighter) pattern or into a larger spot that will not appear to be as bright (even though the total light is the same).

Also note that another wild card is that you vehicle's lens also acts to spread out the light. The original light bulbs are not directional. The light housing is designed to reflect the light from the bulb out the front of the lens. That is why there are coatings on the backside of the housings are reflective and the inside surfaces of the lenses are shaped the way they are.

So if you want the most light, look at the total lumens and the products that have extra LEDs pointed in funny directions (other than straight at the vehicle lens), as they will likely be brighter and perform better. Just total up the lumens and it will give you a feel for the differences.

This is only part of the story because the actual power throughput is based on the current running through the LEDs and the color of the light. In general for these simple circuits, higher vehicle voltage means more current through the LED and a brighter light. The LED bulb’s internal circuitry is the other wildcard and is based on the vendors design. Another thing to consider and play with is the color of the light and to optimize it based on what is using it (cameras and human eyes). Color is also a personal preference. I like the whitest whites and others look at what I like and see too much blue in it (a “white LED” is a blue LED that has yellow colored phosphor on top of it. The phosphor emits the white light).

Like everything else, find what is good for you. It’s just that with this emerging technology, it can get expensive to play around with these things and it is guaranteed that they will continue to get better. Whatever you buy today will be “obsolete” or not nearly as good as what will be available real soon.
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Last edited by MaxQ; 04-28-13 at 12:42 PM.. Reason: corrected title
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Old 04-28-13, 05:07 PM   #47
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Hi 430SILVER

Presuming you ordered yours from over there, could you post the link for SlvBullet please.

Let us know what you think when you get them.

Cheers
Steve
I bought mine on ebay and they are coming from China. They say they have shipped but I can't track them until they hit stateside.
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Old 04-28-13, 06:26 PM   #48
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I've got nearly all my LED's done now. Tomorrow is the last leg (driver side high beam/DRL and parking). Had to wait for a new Decoder. Pics to come soon. iJDMToy is def the way to go.
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Old 06-03-13, 07:54 AM   #49
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Got these on ebay, shipped from china. Unfortunately they are too long. They don't fit! Anyone else have this problem?
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Old 06-03-13, 09:43 AM   #50
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Got these on ebay, shipped from china. Unfortunately they are too long. They don't fit! Anyone else have this problem?
What was the bulb number? Maybe a pic or a link?
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Old 06-03-13, 12:01 PM   #51
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http://www.ebay.com/itm/290657949386...84.m1497.l2649
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Old 06-03-13, 01:54 PM   #52
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Got these on ebay, shipped from china. Unfortunately they are too long. They don't fit! Anyone else have this problem?
They look exactly like mine and they fit perfectly???

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Old 06-03-13, 02:05 PM   #53
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That's really strange. Mine fit perfectly and look exactly the same. And you're sure you're using them as reverse lights (under the bumper) and not as the licence plate lights, right?
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Old 02-26-14, 04:49 PM   #54
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I plan on installing the CREE back up LEDs and would appreciate if someone can tell me how to access them for replacement.
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Old 02-26-14, 05:55 PM   #55
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I plan on installing the CREE back up LEDs and would appreciate if someone can tell me how to access them for replacement.
Just reach under the rear bumper find the reverse light twist the assemble out put in the led bulb test it to be sure it comes on. If it does not light just reverse the bulb then it will light and then replace the socket into the place you twiste dit out from . Should not take more then 10 min to do
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Old 02-27-14, 06:09 AM   #56
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OMG, there's actually something quick and easy to do on these?!?!? Thanks mrblister!
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Old 02-27-14, 11:41 PM   #57
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Super easy! Just a heads up, I had to bend the wires to the other side of the base for mine to work. Let us know how it goes!
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Old 02-28-14, 05:46 AM   #58
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Super easy! Just a heads up, I had to bend the wires to the other side of the base for mine to work. Let us know how it goes!
Are you talking about the wires of the base of the led bulb? I just inserted mine and if they did not light I turned them around and they were fine
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Old 02-28-14, 12:21 PM   #59
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Are you talking about the wires of the base of the led bulb? I just inserted mine and if they did not light I turned them around and they were fine
Yep, exactly, perhaps they sent me a set with the wires flipped on accident? Either way, I tried turning them around but that didn't work... (the wires only ran down one side of the base, per wire...) hard to explain but fairly simple to figure out if you hold it next to an OEM bulb.
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Old 03-02-14, 08:22 PM   #60
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That was way too easy, it literally takes less then five minutes to change out both bulbs. The only surprise is that the original halogens appeared to be brighter than the new CREEs. Maybe it was because it was still daylight out so I'll hold final judgement until I check it out in the evening darkness.
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Old 03-02-14, 08:22 PM
 
 
 
 
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