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Description
921 HP5 Cool White LED Bulbs - Pair (DIODD0031P)The factory 921 size incandescent backup bulbs often produce a weak, yellowish light that fails to provide sufficient visibility when reversing at night. The 921 HP5 LED Bulbs solve this by upgrading your vehicle to a crisp 6000K cool white output. Engineered with high power Samsung LED emitters and a specialized omnidirectional diffusing lens, these bulbs deliver a uniform 360 degree light spread that fills the entire reflector housing. This ensures
The factory 921-size incandescent backup bulbs often produce a weak, yellowish light that fails to provide sufficient visibility when reversing at night. The 921 HP5 LED Bulbs solve this by upgrading your vehicle to a crisp 6000K cool white output. Engineered with high-power Samsung LED emitters and a specialized omnidirectional diffusing lens, these bulbs deliver a uniform 360-degree light spread that fills the entire reflector housing. This ensures a clean, modern look and enhanced light distribution, making it easier to see obstacles and navigate safely while in reverse.
Features
- High-Intensity HP5 Output: Delivers 92 measured lumens of crisp light, providing a significant aesthetic and functional upgrade over standard factory bulbs.
- Omnidirectional Diffusing Lens: Features a unique lens design that ensures light is distributed evenly in all directions (270-degree spread), maximizing the use of your vehicle's factory reflectors.
- Samsung LED Technology: Populated with high-quality Samsung emitters for superior brightness, color consistency, and long-term performance.
- Advanced Circuit Reliability: Built with constant-current inductive circuitry and transient suppression to protect against voltage spikes, ensuring years of flicker-free operation.
- Plug-and-Play Installation: Designed as a direct replacement for 921-size bulbs with a nonpolar circuit, fitting snugly into the factory socket for a fast and simple installation.
Specs
- Measured Lumens: 92 per bulb
- Color Temp: 6000K (Cool White)
- Beam Angle: Omnidirectional (270 degrees)
- Power (watts): 0.92
- Operating Voltage: 9-16V
- Current (amps @ 13.2V): 0.07
- Operating Temperature: -40C to 85C
- Connector(s): OEM-Size Plug and Play
Includes
- Two (2) 921 HP5 LED Cool White Bulbs
Notes
- Compliance: Provides clear white illumination suitable for backup/reverse and cargo applications.
- Warranty: Includes the Diode Dynamics 3 year replacement limited warranty.
- Fitment: Replacement for any 921 bulb size, including T15, 912, and 921LL; nonpolar design for easy installation.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.1 ★★★★★
Based on 14 reviews
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Product Reviews
★★★★★ 5
Nice looking, easy to read, comfortable silicone strap, hard to buckle.
Color: Black
This watch has all the features other Ironman watches have plus a 100 lap interval timer. The interval timer is possibly the reason this watch is slightly more expensive than the other IM variants with the same size and general appearance. I find this watch to be nicer looking when going out to dinner than the more common multi-colored IM watches, though most of the functions are available on the others.
My previous Ironman watch had a resin strap, which was somewhate stiff when putting it on. It was comfortable enough wearing on the river, but later in the day I sometimes took it off for comfort. This watch has a soft, stretchy, more comfortable silicone strap, that, sadly, is hard to buckle and tuck-in.
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Reviewed in the United States on June 4, 2024
★★★★★ 2
Longtime Ironman Wearer -- I Hate This Watch
Color: Black
I've worn the old Ironman 100 Lap Watch for Years
I would still be wearing those watches if the Indigo on them didn't consistently fail.
My main requisite is large, easy to read digital display, and the ability to turn the Indiglo on 20 seconds a day once or twice to see time in dark.
If I could have found a simple watch with a large display made by any other reputable manufacturer I would have bought it instead. I have truly come to dislike Timex because their Indiglo fails so consistently, on (5) different Ironman's I've owned. Doubt this one'll be any better, viewing it a disposable purchase after a year. Unsurprisingly, Timex is an American company, all marketing no quality, and yes I'm an American, looking at something Casio Seiko, Swiss or Japanese made. They get fundamentals right in terms of quality.
The band on this is redesigned. Grippier. Tougher to adjust or put on, but more apt to stay on and not slide once on. I'm used to the old band, don't love or hate this new one. I will usually take my watch off while typing for a long time, not as easy to do with this, not a dealbreaker, can see the sense in making a swimming and exercise watchband a bit tougher.
I hate the branding on this watch. Bright red Ironman logo on both ends of the band near the watch. Even worse is the Timex and Ironman words ATOP the glass on the watch. This means they throw shadows down onto the watch face below the glass. This effect gets even worse with the magnification underwater. Inexcusable design flaw, simply so some corporation can self-advertise its products. The combination of these two sets of branding make the watch look cheap, gaudy, and inappropriate for any remotely formal wearing. This would not have been the case if it was understated in color scheme. Without the two red marks on the band, and the absolutely moronic decision to place the branding on the watch glass, you have something understated you could get away wearing all the time. Not with the branding. There are also two lines running horizontally above and below the time. I hate these when I'm looking at it underwater. Haven't tried the lap functions yet, I usually open lake swim, maybe the lines help with that, but for my use I hate them.
I'm 6'4" tall, people complain the watch is big, it feels to me if anything a bit undersized or the proper size, others may find it big. I would rather have a slightly larger size with bigger numbers.
Biggest plus is time SUPER easy to read. I'd love to be able to turn date off and only have time display and nothing else in some mode. I don't need to check the date 6 times a day. Love to have mode where I press one button, upper left say, and date shows for five seconds or something.
Indiglo about the same as old big Ironman 100, excellent--when it doesn't break which it almost always does. I have many of these watches where the time still shows but Indiglo never works, Timex themselves admitted to me this is a known problem.
The rounder face, versus rectangular, better looks, but wonder if it is optimal way to make most readable.
I would pass on this watch. I have always liked Ironman watches, but the branding is so bad, glass especially, and the absymal quality of Timex Indiglo, are unacceptable.
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Reviewed in the United States on May 9, 2023
★★★★★ 3
Cool & functional
Color: Pink
Attractive watch. Simplistic, yet cannot understand everything without not having instructions. Watch did no come with instructions, which became hard to figure out all its functions.
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Reviewed in the United States on December 28, 2025
★★★★★ 5
Great watch
Color: Black/Digital/Green
Love this watch. Comfortable. reliable. Not too fancy. Inconspicuous. And all for a great price.
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Reviewed in the United States on March 27, 2026
★★★★★ 5
Excellent watch
Color: Black, Gray
Great watch. Waterproof and I use the timer all the time. I'm on my 3rd or 4th one over 20 to 25 years. When the battery dies, I just buy another one because at that point in time the band is usually also going bad.
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Reviewed in the United States on April 27, 2026