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Opel Astra G 1.7 TD: Seeking Suitable Blue LED Bulbs for Backlight Clocks

Bartoszek1998 20949 12
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  • #1 16655320
    Bartoszek1998
    Level 6  
    Posts: 61
    Rate: 10
    Hello, I wanted to replace the bulbs for the backlight clocks in my Opel - I just have no idea which will match, maybe you have any links with these LEDs? I would like them to be blue - thank you in advance! :)
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  • #2 16655695
    mkpl
    Level 37  
    Posts: 5638
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    A matter of what you have TRW or VDO counters. TRW illuminate better and you can use leds corresponding to a 1.5W screw-in light bulb (with plastic) but only SMD. Ordinary light scattering too weakly. There is natural scattering in VDO. Here, it's best to buy a blue cap with a standard bulb.
  • #3 16656856
    Bartoszek1998
    Level 6  
    Posts: 61
    Rate: 10
    The counter looks like this, unless you mean some measure of it or something.
    Opel Astra G 1.7 TD: Seeking Suitable Blue LED Bulbs for Backlight Clocks
    Well, I want new bulbs, because they are already old and you can hardly see it, you can hardly see anything, can you provide some links with these leds? :D
  • #4 16658082
    mkpl
    Level 37  
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    These should work:

    Opel Astra G 1.7 TD: Seeking Suitable Blue LED Bulbs for Backlight Clocks

    The biggest problem is with the backlight of the waveform display. There is a special diffusing bulb (as someone knows where I will buy it) and unfortunately it burned. I currently have a 1.5W regular one and the display has a clear bright spot in the middle. In the case of leds, the effect will be compounded.
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  • #5 16658106
    ociz
    VIP Meritorious for electroda.pl  
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    9117175 - a "milk" bulb can be found after this number.
  • #6 16661280
    Bartoszek1998
    Level 6  
    Posts: 61
    Rate: 10
    mkpl wrote:
    These should work:

    Opel Astra G 1.7 TD: Seeking Suitable Blue LED Bulbs for Backlight Clocks

    The biggest problem is with the backlight of the waveform display. There is a special diffusing bulb (as someone knows where I will buy it) and unfortunately it burned. I currently have a 1.5W regular one and the display has a clear bright spot in the middle. In the case of leds, the effect will be compounded.


    And what is the name of this bulb? :D 1
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  • #7 16661719
    mkpl
    Level 37  
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    You type in "led bulb counters" in the search engine and you can find it without any problems. The best LEDs are SMD5050, they have 3 LEDs connected in parallel in their structure. It is easy to recognize because these diodes have approximately 5 x 5mm dimension 6 leads and 3 structures visible under the "yellow window". This is important because in the diode there are available LEDs pretending to be smd5050 with one structure and glow under ...


    @ociz thank you very much. By the way, this light bulb ...
  • #8 16666561
    Bartoszek1998
    Level 6  
    Posts: 61
    Rate: 10
    Opel Astra G 1.7 TD: Seeking Suitable Blue LED Bulbs for Backlight Clocks
    Will they be okay? And tell me how many I have to buy to illuminate the entire counter :P

    Added after 8 [minutes]:

    And which kind? B8 5D, B8 4D, B8 3D, R5
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  • #9 16666814
    ociz
    VIP Meritorious for electroda.pl  
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    The original are in the Bx8.4 frame but Bx8.5 will also come.
    3 pieces are going plus one milky one to light the display.
  • #10 16666825
    Bartoszek1998
    Level 6  
    Posts: 61
    Rate: 10
    Thanks for help, I order tomorrow - I will not close the topic so far in case of problems I will write :)
  • #11 16672168
    Bartoszek1998
    Level 6  
    Posts: 61
    Rate: 10
    Well, we have a problem, when I put the light bulb it goes so loosely and it doesn't shine ... Anyone any ideas?
  • #12 16672280
    mkpl
    Level 37  
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    Bend the contacts once and twice check the polarity of the bulb because it can be inserted right and wrong.
  • #13 16672684
    Bartoszek1998
    Level 6  
    Posts: 61
    Rate: 10
    The contacts are off, and I have no idea what the polarization is about. : /
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Topic summary

✨ The discussion revolves around replacing the backlight bulbs for the clocks in an Opel Astra G 1.7 TD with blue LED options. Users highlight the importance of bulb compatibility, noting that TRW counters illuminate better than VDO. Recommendations include using SMD5050 LEDs, which consist of three LEDs in parallel, and specific bulb types such as B8 4D and B8 5D. Users also discuss issues with bulb fitting and illumination, suggesting checking contacts and polarity for proper installation. Links to potential LED options are shared, and users express gratitude for assistance while seeking further clarification on bulb specifications.
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FAQ

TL;DR: “3 pieces plus one milky” — that’s your count: three blue cluster bulbs plus one diffusing LCD bulb; “3 pieces plus one milky.” Use Bx8.4 holders (Bx8.5 also fits). [Elektroda, ociz, post #16666814]

Why it matters: This avoids dim gauges, hotspots, and fitment issues when upgrading Opel Astra G clock backlights.

Who this is for: Opel Astra G 1.7 TD owners asking which blue LEDs fit, how many to buy, and how to fix non‑working bulbs.

Quick Facts

Which blue LED bulbs fit the Opel Astra G 1.7 TD instrument cluster?

Use LED bulbs in Bx8.4 holders for the main cluster; Bx8.5 also fits. Plan for three bulbs for the gauges and one diffusing bulb for the LCD. Choose blue LEDs if you want a blue backlight effect. [Elektroda, ociz, post #16666814]

TRW vs VDO clusters: which behaves better with LEDs?

TRW clusters illuminate better with LEDs. VDO clusters scatter light naturally, so a standard bulb with a blue cap gives more even results than a bare blue LED. If you have VDO, prioritize the cap approach. [Elektroda, mkpl, post #16655695]

Are SMD5050 LEDs the best choice for these gauges?

Yes. "The best LEDs are SMD5050." They use three parallel LED dies in one 5×5 mm package, improving brightness and coverage. This tri‑die design is a concrete performance boost. Avoid look‑alikes with a single internal die. [Elektroda, mkpl, post #16661719]

What bulb should I use to light the small LCD/waveform display?

Use a diffusing “milky” bulb; search by the identifier 9117175. This matches the required frosted style that spreads light across the LCD, reducing hotspots compared with clear lamps. [Elektroda, ociz, post #16658106]

How many bulbs do I need to illuminate the entire cluster?

Buy four in total: three bulbs for the gauges and one diffusing “milky” bulb for the LCD display. This count covers the standard Astra G cluster layout for even lighting. [Elektroda, ociz, post #16666814]

My new bulb sits loosely and doesn’t light—how do I fix it?

Gently bend the contacts to improve grip, then check LED polarity by rotating the bulb 180 degrees and testing again. LEDs are directional; reversed polarity prevents lighting. Reseat until it’s snug and illuminated. [Elektroda, mkpl, post #16672280]

What does LED “polarity” mean here, and how do I check it?

Polarity means LEDs only light when current flows the right way. If it doesn’t light, pull the holder, rotate the LED 180 degrees, and test. Repeat until it lights and sits firmly after contact adjustment. [Elektroda, mkpl, post #16672280]

Will blue LEDs create bright spots or uneven lighting on the display?

Yes, especially on the LCD. The display uses a special diffusing bulb; using a regular bulb causes a bright center spot, and LEDs intensify that effect. A proper “milky” bulb spreads light evenly. [Elektroda, mkpl, post #16658082]

What is a Bx8.4d/Bx8.5d bulb holder?

It’s the miniature twist-lock base used in many instrument clusters. The Astra G originally uses Bx8.4; Bx8.5 is a near-identical variant that also fits the socket mechanically. Choose either for replacement. [Elektroda, ociz, post #16666814]

How can I spot a genuine SMD5050 LED versus a weaker imitation?

Check the package: real SMD5050s are about 5×5 mm, with six leads and three visible LED structures under the phosphor. Imitations may hide a single die, giving dimmer, narrower light. [Elektroda, mkpl, post #16661719]

Can I keep standard bulbs and just use blue caps instead?

For VDO clusters, yes. A standard bulb with a blue cap gives more uniform light because the cluster already diffuses it well. This approach avoids LED hotspot issues in VDO units. [Elektroda, mkpl, post #16655695]

How do I replace and test the bulbs safely? (3‑step quick guide)

  1. Remove the cluster and twist out each Bx8.x holder carefully.
  2. Insert the LED, bend contacts slightly for snug fit, and re‑seat.
  3. Test; if dark, rotate the LED 180° to correct polarity, then retest. [Elektroda, mkpl, post #16672280]

What if I only have R5 wedge bulbs—will they work here?

No. The Astra G cluster expects Bx8.4 holders, though Bx8.5 also fits. Using wedge-style R5 bulbs won’t lock into the twist sockets correctly. Stick with Bx8.x bases for proper fit. [Elektroda, ociz, post #16666814]

Any edge cases or failure modes I should expect with this swap?

Expect hotspots on the LCD if you skip the diffusing bulb. LEDs can accentuate a bright central spot versus a frosted lamp. Use the “milky” type for the display to avoid uneven illumination. [Elektroda, mkpl, post #16658082]
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