Heat lamp bulbs that burn out fast are usually the wrong bulb for the fixture, getting hit by water or grease, being bumped while hot, or sitting in a worn or loose socket. Check those four things first; if bulbs still fail early, have an electrician check the voltage and the circuit.
Shop the equipment in this article: heat lamps and strip warmers, bain marie food warmer and steam table. Freight is included on every order.
Bulb heat lamps are common over passes, carving stations and buffet lines. A bulb that keeps failing costs more than the bulb: food sits without heat, and a shattered bulb over open food is a safety problem. This guide goes through the causes in order of how often they happen, then covers when a strip warmer makes more sense.
Use the bulb the fixture was built for
Heat lamp fixtures are rated for a bulb type and wattage. A higher wattage bulb than the fixture is rated for runs the socket and wiring hot and shortens bulb and socket life. A household bulb is not built for the heat. Check the manual or the label on the fixture and buy that bulb.
The Prepline WL550 freestanding heat lamp on our site, for example, uses two bulbs of 275 W each. Replace with the same rating.
Protect the bulb as the Food Code requires
Bulbs over exposed food must be shielded, coated or otherwise shatter-resistant. For heat lamps the rule is specific: in Virginia’s adoption of the Food Code (12VAC5-421-2890), an infrared or other heat lamp must be protected by a shield that surrounds and extends beyond the bulb so that only the face of the bulb is exposed. Use coated, shatter-resistant bulbs where the manufacturer allows them, and do not run a fixture with its shield or guard missing.
Keep water and grease off the bulb
A hot bulb hit by a splash of cold water, steam or grease can crack. Common causes:
- Steam from pans or a steam table below rising straight onto the bulb.
- Staff wiping the lamp with a wet cloth while it is on.
- Spray from a pre-rinse or a dish area nearby.
- Grease vapor from a fryer or griddle settling on the glass.
Turn the lamp off and let it cool before cleaning. Move the lamp, or the steam source, so the bulb is not in the vapor path.
Reduce bumps and vibration
The filament of a hot bulb is fragile. Heat lamps hit by plates, hotel pans or a server’s head fail early. So do lamps on a fixture that shakes, such as one mounted to a shelf over a pass that gets slammed, or a freestanding unit that is moved while on. Set the height so staff and plates clear it, and move portable lamps only when cool.
Handle bulbs carefully
Install a new bulb with the lamp off and cool, holding it by the base or with a clean dry cloth. Oil from fingers on the glass can create hot spots on some bulb types (common advice from bulb makers). Tighten until snug; over-tightening can damage the socket.
Check the socket
A loose, corroded or scorched socket makes poor contact, which heats the base and burns out bulbs. Signs: discoloration around the base, a bulb that flickers, or a bulb that is hard to remove. A damaged socket must be replaced by a qualified person; it is a fire risk.
Check voltage and the circuit
A supply voltage higher than the bulb’s rating shortens its life. Heat lamps sharing a circuit with fryers, toasters or warmers can see voltage swings when other equipment cycles. If several lamps on the same line fail often, ask an electrician to check the voltage at the outlet and the load on the circuit.
Limit switching on and off
Each start is the hardest moment for a filament. Switching lamps on and off many times in a shift wears bulbs faster. Many kitchens leave pass lamps on through service and off between services.
Consider a strip warmer
A strip warmer uses a heating element in a long housing instead of separate bulbs, and suits a long pass. The Prepline SW series uses an element: the SW24 is 500 W, the SW60 is 1,550 W, both 120 V with mounting brackets and support chains included. The L&J LJFW series are strip heat lamps with an infrared bulb in a stainless housing with a reflector, from 24 to 72 inches. See all heat lamps and strip warmers.
Holding temperature
Heat lamps are for short holding at the pass. The Food Code asks that hot food be held at 135 F or above (12VAC5-421-820). Heat lamps are one of the units the code exempts from needing a built-in thermometer (12VAC5-421-1320), so check food with a probe thermometer. For longer holding of sides and sauces, a bain marie food warmer or a steam table holds food in water-heated wells, and a holding cabinet holds full pans.
A simple bulb log
Write down the date each bulb is replaced and its position. If one position keeps failing, the cause is that socket, that circuit, or something splashing it.
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Freight with liftgate delivery to the 48 contiguous states is included in the price. Powered equipment has a 7 day return window from delivery.
Frequently asked questions
Can I use a regular bulb in a heat lamp?
No. Use the heat lamp bulb type and wattage the fixture is rated for, shielded or shatter-resistant as required over food.
Why do my heat lamp bulbs explode?
Usually water or grease hitting the hot glass, or a bump while the bulb is hot. A missing shield makes a broken bulb more dangerous.
How high should a heat lamp be over food?
Follow the manual. Lower gives more heat and can dry food; the WL550 page says to lower the lamps for more heat and raise them for less.
Is a strip warmer better than a bulb lamp?
For a long pass, a strip warmer gives even heat with no bulbs to change. Bulb lamps suit single plates and carving stations.
Your local health department has the final say on how hot food is held.