Otoscope and ophthalmoscope bulb voltage: 3.5 V or 2.5 V?
Replacement bulb voltage has to match your instrument. Here is how to check it, and the voltage listed for each ELVION bulb.
Otoscope and ophthalmoscope lamps are made for different voltages. Two that appear on ELVION pages are 3.5 V and 2.5 V. The voltage has to match your instrument, so check it before you order a replacement bulb.
Why otoscope bulb voltage matters
The lamp voltage has to match the handle's supply voltage. The HEINE instructions for use say to confirm this before fitting a new lamp, and mention a colored marking on the lamp base that identifies the voltage. Fitting a lamp with the wrong voltage can damage the instrument or the lamp.
How to check your instrument's voltage
- Your instrument manual. The lamp or bulb replacement section normally names the lamp and its voltage.
- The old bulb or its packaging. Some bulbs carry a marking on the base, and earlier packs may show the voltage you used last time.
- The maker's lamp chart. Welch Allyn's chart lists lamp references for each instrument, but it does not state voltage or wattage, so use it to find the reference and your manual for the voltage.
- Ask us. Send us the model printed on your instrument and we will tell you whether we can confirm a matching ELVION bulb.
Voltage listed for ELVION bulbs
These are the voltages listed for the ELVION bulbs. They are not a statement about your instrument, so match both the lamp reference and the voltage in your own manual.
| ELVION model | Type | Voltage listed |
|---|---|---|
| 03000-U | Replacement bulb | 3.5 V |
| 03100-U | Replacement bulb | 3.5 V |
| 03800-U | Replacement ophthalmoscope bulb | 3.5 V |
| 03900-U | Replacement ophthalmoscope bulb | 2.5 V |
| 03400-U | Replacement otoscope bulb | Still being confirmed |
| HPX06500 | Replacement otoscope bulb | Still being confirmed |
Match the lamp reference as well as the voltage
Two bulbs with the same voltage are not always interchangeable. Choose the bulb by the lamp reference in your manual, then check the voltage. See how to find your lamp reference and how to choose a replacement bulb. Looking for a Welch Allyn otoscope model? Try the Welch Allyn otoscope bulb lookup.
Sources
- HEINE otoscopes: instructions for use (HEINE Optotechnik): lamp replacement and voltage checks.
- Welch Allyn lamp replacement chart (PDF) (Baxter/Hillrom support): lists lamp references by instrument, with no voltage or wattage.
Frequently asked questions
Can I use a 3.5 V bulb in a 2.5 V instrument?
No. The lamp voltage has to match the handle's supply voltage, and fitting a lamp with the wrong voltage can damage the instrument or the lamp. Check your manual first.
What voltage is the ELVION 03100-U bulb?
The ELVION 03100-U is listed at 3.5 volts. The lamp voltage has to match your instrument, so check your instrument manual before ordering.
What voltage is the ELVION 03900-U ophthalmoscope bulb?
The ELVION 03900-U is listed at 2.5 volts. Check your instrument manual before ordering.
Which ELVION bulbs are listed at 3.5 V?
03000-U, 03100-U and 03800-U are listed at 3.5 volts.
What voltage are the 03400-U and HPX06500 bulbs?
We are still confirming the voltage for 03400-U and HPX06500. Please check the lamp voltage in your instrument manual and ask us before ordering those two.
Where do I find my instrument's voltage?
Look in the lamp or bulb replacement section of your instrument manual, or on the packaging of your last bulb. If you cannot find it, send us the model printed on your instrument and we will help.
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.