How to Change SL-7 Slit Lamp Bulbs

Written by tom king
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How to Change SL-7 Slit Lamp Bulbs
Slit lamps use high-intensity halogen lamps. (microscope image by Fotocie from

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

Skill level:

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Things you need

  • Replacement bulb

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  1. 1

    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.

  2. 2

    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.

  3. 3

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

  4. 4

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

  5. 5

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

  6. 6

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

  7. 7

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

Tips and warnings

  • 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.

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