Vintage Flush Mount and Antique Ceiling Lights: What to Check

A vintage flush mount meets the ceiling with no stem, while a semi-flush light hangs on a short rigid neck. To buy one, measure the total drop, width, canopy and glass fitter, check the glass for chips at the rim, and have an electrician check the old wiring and the ceiling box before it goes up.

Flush, semi-flush or pendant: how do you tell?

The space between the ceiling and the fixture tells them apart. Old House Lights, an archive of antique lighting catalogs, sets out three forms:

The same archive cautions that period catalogs show “a continuum, not three boxes,” and that a canopy or stem may have changed during rewiring. Trust the measurements more than the listing’s label. A low ceiling or a hallway usually needs a true flush mount; a semi-flush light gives a little more glow across the ceiling where you have the headroom.

Vintage flush mount and semi-flush ceiling lights

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What should you measure before you buy?

Ask the seller for these numbers, or measure them yourself at a sale:

1. Total drop: ceiling to the lowest point of the fixture.
2. Width: the widest point of the glass or the body.
3. Canopy diameter: it has to cover the ceiling box and any old paint line.
4. Fitter size: the outside diameter of the glass neck and the inside opening of the holder.

Old House Lights recommends photographing the fixture square to the ceiling, then the canopy, stem, socket cluster and shade supports up close. Those views show whether the glass and the hardware belong together.

Milk glass, opal or frosted: what is the shade made of?

Listings use these words loosely. The Corning Museum of Glass defines them:

• Milk glass (lattimo): “opaque white glass, usually opacified by tin oxide or arsenic.” Light passes through it only faintly.
• Opal glass: “translucent and white, with a grayish or bluish tinge.” It lets more light through than milk glass, and Old House Lights describes the classic schoolhouse globe as opal glass.
• Frosted glass: glass with “a matte finish produced by exposing the object to fumes of hydrofluoric acid.” Many deco shades are frosted or acid-etched clear glass.

Hold a shade up to a window or a phone light. If you can barely see the light through it, it is closer to milk glass; an even, bright glow means opal or frosted glass. For table lamps in these glasses, see milk glass lamps and art deco frosted glass lamps.

The stepped opal globe known as a schoolhouse shade fits many flush and semi-flush fixtures. Old House Lights notes that a 1934 Lightolier catalog offered the same glass close to the ceiling, on short stems and on chains. Our schoolhouse and bankers lamp guide covers that shade in more detail.

Schoolhouse lights and opal glass shades

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How do you replace a missing or broken shade?

Match the holder, not just the shape. Old House Lights warns that two shades with the same fitter size may still not fit if the holder uses a different retaining method, such as thumb screws, spring clips or a lip. Check the clearance too: a neck can fit while the glass still hits the socket or the bulb.

For deco pan fixtures with several small shades, see the slip shade section of the art deco lamp shade guide.

Will the ceiling box and sockets suit a vintage flush mount?

• Weight. EC&M explains that under NEC Section 314.27 a ceiling box must support “a luminaire weighing a minimum of 50 lb.” Most flush mounts weigh far less, but a heavy cast fixture may need a box listed for more.
• Bulb limit. The NIH Office of Research Services says a light fixture should have a sticker giving the maximum bulb wattage. An old fixture that has lost its sticker should get a conservative bulb until an electrician rates the sockets.
• Heat under the glass. A closed flush mount traps heat, so a cooler LED bulb that fits inside the glass is easier on old sockets.

Art deco ceiling lights and chandeliers

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For chandeliers, pendants and sconces, see the chandelier and ceiling light guide, and for wall lights to match, the antique wall sconce guide. Back to the art deco lighting guide.