How to Find the Right Replacement Bulb
, by Tejas Jani, 4 min reading time
Not sure which replacement bulb your equipment needs? Learn how to identify the right lamp by voltage, wattage, and base type — even without the model number.
How to Find the Right Replacement Bulb (Even If You Don't Know the Model Number)
If a lamp has died in a piece of medical, dental, laboratory, or marine equipment, the fastest way to get the right replacement is to identify it by its exact specifications — not by guessing based on "it's a small bulb that goes in the light thing." The good news: almost every specialty lamp has its full spec printed directly on it, and once you know what to look for, finding the right match takes minutes.
Step 1: Check the bulb itself first
Before assuming you need to search online, look at the old bulb. Most halogen and xenon replacement lamps have their specifications printed in tiny text on the glass or metal base, including:
- Voltage (e.g. 12V, 22.8V, 24V)
- Wattage (e.g. 50W, 100W, 150W)
- Base type (e.g. G4, G6.35, GY6.35, GZ6.35, BA15D)
- Brand and model code (e.g. Osram 64627, Philips 5995 EJM)
If you can read even part of this, you can search it directly — for example "Osram 64627" or "22.8V 150W G6.35" will usually take you straight to the exact match.
Step 2: If the bulb is unreadable or missing, check the equipment itself
If the old bulb is burnt out, broken, or the text has worn off, check:
- The equipment's user manual or spec plate — most medical, dental, and lab equipment manufacturers list the exact replacement lamp part number in their documentation
- The equipment model name — some replacement lamps are sold by the equipment they fit (for example, a slit lamp bulb for the Haag Streit HS 900-930, or a bulb built specifically for Hanaulux dental lights)
Step 3: Match by base type if you're still unsure
Base type is one of the most reliable ways to narrow things down, since it determines whether a bulb physically fits at all — even if the wattage varies slightly. Common bases you'll encounter across medical, dental, and lab equipment include G4, G6.35, GY6.35, GZ6.35, Bx22d, BA15D, and E14. If your equipment uses a bayonet-style twist-lock base versus a two-pin push-fit base, that alone rules out most incorrect options.
Step 4: When in doubt, ask before you buy
Fitting the wrong voltage or wattage bulb can shorten its life dramatically or damage sensitive equipment. If you're not 100% sure which lamp matches your equipment, it's worth checking with a supplier who stocks the exact part rather than guessing with a generic "close enough" substitute — particularly for clinical equipment where consistent brightness and colour accuracy affect diagnostic accuracy.
Where to buy the right replacement in Australia
At TechLamps, our catalogue is organised by exact specification, so once you know what you're looking for, you can search directly by model number, voltage, wattage, or base type. Browse by category to narrow things down:
If you're still not sure which bulb you need, feel free to get in touch with your equipment's model name or a photo of the old bulb, and we'll help you find the right match.