How to Change SL-7 Slit Lamp Bulbs

A slit lamp is a high-intensity light source, part of equipment used by an opthamologist that can be focused as a slit and allows the doctor to examine the surface and interior of the eye. A slit lamp is also used as a high-intensity illumination for biomicroscopes. The light source is often passed through a beam splitter for special applications. The lamp uses a high-intensity halogen bulb at the heart of the system. Changing the bulb requires only basic precautions

Unplug the power cord to the lamp. If the lamp is on a tower illumination assembly, loosen the two screws that hold the lamp cover in place and remove the cover. Zeiss-type systems will only have a single, hand-turned screw to remove.

Pull straight back on the power lead connection to the bulb. Avoid twisting or bending the connection so as not to damage the connector or the bulb. Newer models will have a plastic connector that plugs into the pins on the bottom of the lamp. On older models, the power leads may connect directly to the lamp bulb pins.

Remove the screw that holds the lamp clip in place. Remove the halogen bulb carefully. They get very hot.

Replace the bulb with a matching halogen bulb. Be very careful not to touch the lamp bulb with your bare fingers while replacing it.

Replace the lamp retaining clip and its screw after you have seated the bulb.

Reconnect the power leads to the pins of the halogen bulb.

Screw the lamp cover back in place and tighten the screws finger tight. Plug the lamp back in and you are ready to go.


Wear cloth gloves when handling halogen bulbs. The oils on your bare hands could transfer to the glass bulb. Because of the high heat at which the bulb operates, this could cause premature failure of the bulb.

Things You'll Need

  • Replacement bulb
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About the Author

Tom King published his first paid story in 1976. His book, "Going for the Green: An Insider's Guide to Raising Money With Charity Golf," was published in 2008. He received gold awards for screenwriting at the 1994 Worldfest Charleston and 1995 Worldfest Houston International Film Festivals. King holds a Bachelor of Arts in communications from Southwestern Adventist College.