A describes the common pear-shaped envelope, and 15 indicates nominal diameter in eighths of an inch. It does not identify the base.

Will an A15 fit an A19 socket?

It may if both use the same base and voltage, but fixture clearance, lumen output and application markings still need verification.

How bright is an A15 bulb?

Brightness varies by product and should be selected in lumens. Envelope size and LED wattage do not guarantee one output.

Can an A15 LED be used in a ceiling fan?

Use it only when the lamp and fan fixture are compatible with the base, size, voltage, enclosure and vibration conditions.

Can any A15 bulb be used in an oven?

No. Ovens require lamps explicitly designed for high temperature. Ordinary LED driver electronics may be damaged or unsafe in that environment.

What should a buyer put on a purchase order?

Include base, voltage, dimensions, lumens, watts, CCT, color quality, dimming, enclosure/appliance suitability and certification model.

A15 Bulb Guide: Everything You Need to Know

2024-06-28

Original CPS Lighting source image for A15 bulb — A15 bulb overview

1. What the A15 Shape Means

A15 identifies an A-shaped lamp with a nominal maximum diameter of 15 eighths of an inch, approximately 1.875 inches or 48 mm. The code describes the envelope, not the screw base, wattage or brightness.

An A15 can be supplied with an E26 medium base, an E12 candelabra base or another configuration depending on market and product. Buyers should record maximum overall length as well as diameter because compact glass shades and fan housings often have tight clearances.

For related planning resources, review the CPS Lighting product center.

2. A15 Versus A19

An A19 envelope is nominally four eighths of an inch wider than A15 and is usually longer. Both can share an E26 base, which makes them electrically insertable but not necessarily mechanically suitable.

An A19 may touch a shade, block airflow or extend beyond the intended optic. Conversely, replacing an A19 with a lower-output A15 can reduce task light. Check the fixture label, available space and desired lumens instead of assuming a shared base means a complete substitute.

Feature	A15	A19	Selection effect
Nominal diameter	15/8 in. ≈ 48 mm	19/8 in. ≈ 60 mm	A15 fits tighter envelopes
Base	Varies; often E26 or E12	Varies; often E26	Verify separately from shape
Brightness	Product-specific lumens	Product-specific lumens	Do not infer from envelope
Typical fit	Fans, appliances, compact shades	General lamps and larger shades	Check label and clearances

For related planning resources, review the lighting case library.

3. Base and Voltage Must Match

Match base, supply voltage and frequency exactly. E26 and E27 are physically similar systems but should not be treated as interchangeable without the lamp and holder specifications for the destination market.

In North America, A15 products commonly appear at 120 V, while other markets use different ratings. Never force a lamp into a holder. For fixtures with multiple lamps, confirm total load and dimmer minimum/maximum limits after conversion to lower-wattage LEDs.

For related planning resources, review the lighting news center.

4. Choose Lumens, CCT and Color Quality

Buy brightness by lumens rather than an incandescent “watt equivalent.” ENERGY STAR consumer guidance uses about 450 lumens for a traditional 40 W brightness class and 800 lumens for 60 W, but an A15 product may fall above or below those points. Select CCT for the space and examine CRI or more complete color data where merchandise or finishes matter.

A frosted envelope softens source brightness; clear decorative filaments can produce sharper glare and different distribution.

For related planning resources, review the CPS Lighting company profile.

5. Appliances and Enclosed Fixtures

Ceiling fans introduce vibration and sometimes enclosed shades. Refrigerators, ovens and range hoods add temperature, moisture or grease. A normal A15 LED should not be assumed suitable for every appliance.

Look for explicit appliance, damp-location, enclosed-fixture or temperature statements as required. Oven lamps are a special high-temperature application and ordinary LED electronics generally do not belong there unless specifically listed. In sealed fixtures, verify the product’s enclosure suitability to avoid overheating.

For related planning resources, review the project consultation team.

6. Procurement and Sample Checks

For bulk purchase, approve physical samples in the actual fixture. Check fit, startup, flicker, dimming, fan vibration, color consistency and thermal behavior after warm-up.

Match product and carton model numbers to the certification record. Record lumens, watts, CCT, CRI, voltage, base, diameter, length and permitted operating orientation. This specification is more reliable than ordering “A15 LED” alone and reduces returns caused by mechanical or application mismatch.

For related planning resources, review the CPS Lighting.