Welch Allyn otoscope bulb replacement: find the lamp reference by model
Bulbs are sold by lamp reference, not by instrument model. This page matches Welch Allyn otoscope model numbers to the lamp reference Welch Allyn's own chart lists for them.
If you search for a Welch Allyn otoscope light bulb replacement, you usually start from the number on your instrument, such as 20000 or 25020. The bulb itself is identified by a lamp reference, such as 03100-U or 03400-U. Welch Allyn's own lamp replacement chart connects the two. The table below repeats the otoscope entries from that chart for the lamp references ELVION sells.
Welch Allyn otoscope models and their lamp reference
This is the original manufacturer's listing (Baxter/Hillrom support chart, read 9 October 2026, re-checked 15 October 2026). It is not an ELVION fit guarantee, and the chart gives no voltage or wattage. Always check your own manual too.
| Welch Allyn instrument | Lamp reference in the chart | ELVION page |
|---|---|---|
| Otoscope 20000 | 03100-U | 03100-U bulb |
| Otoscope 20200 | 03100-U | 03100-U bulb |
| Otoscope 20202 | 03100-U | 03100-U bulb |
| Otoscope 21700 | 03100-U | 03100-U bulb |
| Otoscope 25000 | 03100-U | 03100-U bulb |
| Otoscope 25020 | 03100-U | 03100-U bulb |
| Otoscope 25200 | 03100-U | 03100-U bulb |
| Otoscope 21110 | 03400-U | 03400-U bulb |
| Otoscope 21111 | 03400-U | 03400-U bulb |
| Otoscope 24000 | 03400-U | 03400-U bulb |
| Otoscope 24011 | 03400-U | 03400-U bulb |
| Otoscope 24020 | 03400-U | 03400-U bulb |
| Otoscope 24031 | 03400-U | 03400-U bulb |
| PocketScope otoscope with throat illuminator 22820 | 03400-U | 03400-U bulb |
| Macroview otoscope 23810 | 06500-U | HPX06500 bulb |
| Macroview otoscope 23814 | 06500-U | HPX06500 bulb |
| Macroview otoscope 23820 | 06500-U | HPX06500 bulb |
| Macroview otoscope 23810-L | 06500-U | HPX06500 bulb |
| Macroview otoscope 23820-L | 06500-U | HPX06500 bulb |
| Digital Macroview otoscope 23920 (marked obsolete in the chart) | 06500-U | HPX06500 bulb |
The chart also lists illuminators and other accessories for 03100-U and 03400-U. The full lists are on the 03100-U and 03400-U pages. The chart lists the Macroview family as 06500-U, while ELVION's bulb is named HPX06500, so ask us to check your Macroview model before you order.
Head number or handle number?
Many Welch Allyn sets use one handle with several heads, and each head can take a different lamp. The lamp is usually chosen by the head, so note the numbers printed on both the head and the handle. If you are not sure which number to use, see how to find your lamp reference.
If your otoscope model is not listed
The table covers only the lamp references ELVION sells. A model that is not listed may use a different reference, and that does not mean a bulb for it is unavailable. Check your manual, or send us your instrument model and we will tell you whether we can confirm a matching ELVION bulb. We do not guess.
Before you order
- Confirm the lamp reference in your instrument manual matches the one in the table.
- Check the lamp voltage against your handle. See the bulb voltage guide.
- Open the ELVION page for that reference and use its Buy button to see the exact Amazon listing.
- When the bulb arrives, follow how to replace a bulb safely. Light still not working? See what to check when the light will not come on.
Sources
- Welch Allyn lamp replacement chart (PDF) (Baxter/Hillrom support): device models listed for lamp references 03100-U, 03400-U and 06500-U.
Frequently asked questions
Which lamp reference does Welch Allyn list for the 25020 otoscope?
Welch Allyn's lamp replacement chart lists lamp reference 03100-U for otoscope 25020. Confirm it in your own manual before you order.
Which lamp reference does Welch Allyn list for the 21110 otoscope?
Welch Allyn's lamp replacement chart lists lamp reference 03400-U for otoscope 21110. Confirm it in your own manual before you order.
Which lamp reference does Welch Allyn list for the Macroview 23820 otoscope?
Welch Allyn's lamp replacement chart lists the 06500-U family for Macroview otoscope 23820. ELVION sells this lamp under the name HPX06500, which does not appear in the chart, so ask us to check before you buy.
Is the 03100-U bulb the same as the 03400-U bulb?
No. They are separate lamp references that the chart lists for different instruments. Bulbs that look alike are not always interchangeable, so match the reference in your manual.
My otoscope model is not in the table. What should I do?
The table only covers the references ELVION sells. A model that is not listed may use a different lamp reference. Check your manual or the full Welch Allyn chart, or send us the model printed on your instrument and we will tell you whether we can confirm a matching ELVION bulb.
Is ELVION made by Welch Allyn?
No. ELVION is an independent brand. Welch Allyn is a trademark of its owner and is used here only to identify the manufacturer's chart and instruments.
ELVION is an independent brand. Welch Allyn®, PanOptic, PocketScope, Hillrom®, HEINE® and other instrument names are trademarks of their respective owners. ELVION is not affiliated with or endorsed by those companies. Names are used only to identify the manuals referred to.
Not sure which bulb you need?
Send us the model number printed on your instrument. We will tell you which ELVION bulb matches before you buy.