Bare Lamp or Lamp With Module? How to Re-House a Bare Burner Safely

A bare projector lamp is the burner and, usually, its reflector supplied without the plastic cage; a lamp with module is that same assembly already fitted into the projector-specific housing. Bare costs less and the optics are identical, but you transfer the burner into your old housing yourself and must seat it exactly where the original sat. If the housing is bonded, cracked, or the burner is cemented to a factory-aligned reflector, buy the module.

Every lamp here carries one of those two suffixes in its title, so the choice is made when you add to cart. For the terminology, read projector lamp vs bulb vs module. This is the buy decision and the physical swap.

What you are actually choosing between

Both put the same class of arc burner in front of the same optics. What differs is how much assembly is already done, and who carries the risk.

• Bare lamp: the quartz arc tube, normally bonded into its reflector, with leads attached. No cage, no connector shell — you reuse the cage from the failed lamp.
• Lamp with module: the burner already in the correct housing, with connector, clips, shielding and any interlock tab fitted. It drops straight into the lamp door.
• Price: bare is cheaper, since you are not paying for the molded housing or assembly labor. How much cheaper varies by platform — see projector lamp prices.
• Time and risk: a module swap takes five minutes and is hard to get wrong. A careful re-house takes 30 to 60 minutes the first time you meet a housing design, and has two failure modes: misalignment, and contaminating the quartz.

Who should choose bare, and who should not

The split is less about skill than about volume, tooling, and what happens if the room stays dark.

• Buy bare if: you maintain several identical projectors, have opened one of these housings before, have a clean bench and lint-free gloves, and a failed attempt is an inconvenience rather than a cancelled event. Across a fleet the saving multiplies, and one spare module covers the attempt that goes wrong.
• Buy the module if: this is a single projector, the room is in use tomorrow, or the unit is ceiling-mounted and you would rather not take it down twice.
• Buy the module if: the old housing is damaged — cracked plastic, melted tabs, a broken latch, warped shielding. A bare burner in a compromised cage is a thermal problem waiting to happen.

When a bare lamp is genuinely not an option

Some housings are not built to be opened, and no amount of care changes that. Check before you order.

• Bonded assemblies: housings ultrasonically welded or glued rather than screwed. They open only by breaking, and do not go back together reliably.
• One-way clips: plastic latches designed to snap home once. They shear on removal, leaving nothing to hold the burner at the correct depth.
• Cemented burner-to-reflector: on many designs the arc tube is cemented into the reflector in a position set on a factory jig. If your bare lamp does not arrive as a burner-plus-reflector unit matching that geometry, you cannot recreate it on a bench.

Alignment: the one thing that decides the outcome

This is the part that gets skipped, and the part that matters. The arc gap sits at the focal point of an elliptical reflector, which images that arc into the projector's integrator rod or lens array. Position is set in three axes at the factory, to tolerances you cannot eyeball. Stray light that misses the optical path is absorbed inside the housing as heat, which is why misaligned bare lamps often fail early rather than simply dimming.

• Too far back or forward: the arc image lands short or long of the integrator entrance. You lose lumens across the whole image and the projector looks tired at full power.
• Off-axis: uneven illumination — a bright zone on one side, a dim corner, or a hot spot no keystone or lens shift will fix.
• Tilted: the arc runs wrongly oriented to its designed convection path, which shortens life and can crack the envelope.
• The rule: if the new burner does not sit in the cage exactly as the old one did, on the same seats and standoffs, stop. Do not shim, pack or glue it into position.

Re-housing a bare lamp, step by step

Assume you are handling pressurised quartz that was recently at several hundred degrees, and take the sequence in order.

• 1. Power down and unplug: shut down through the projector's own menu so the fans finish their cool-down, then switch off at the wall and unplug. Do not pull the cord mid-cycle.
• 2. Let it cool, longer than you think: quartz and internal shielding stay dangerously hot far longer than the outer case suggests. Allow 30 to 45 minutes minimum, more after a full day's run.
• 3. Work clean, and photograph everything: good light, clear surface, lint-free gloves, a small driver, a parts tray and isopropyl alcohol. Before you disturb anything, photograph the module from several angles, noting connector orientation, wire clip positions and screw lengths.
• 4. Open the housing: remove only the fasteners holding the burner. If you are prying a welded seam or hearing clips crack, stop.
• 5. Never touch the quartz: skin oils cause devitrification — the quartz crystallises, clouds, weakens and can rupture. Wear lint-free gloves; handle the burner by its ceramic base or reflector only.
• 6. Transfer the hardware: move ceramic retaining clips, insulating sleeves, wire guides and the connector across exactly as they came off. Ceramic is brittle; do not overtighten.
• 7. Seat the burner as the original sat: it should drop onto the same locating features with the same faces bearing, with no gap to close by force.
• 8. Check leads and polarity: match connector orientation to your photographs and keep the high-voltage lead clear of metalwork and fans.
• 9. Reassemble and reset hours: refit the housing, close the lamp door so the interlock engages, power up, and reset the hour counter or you lose track of real life. Full procedure: how to replace a projector lamp.

Knowing when to stop, and what to do with the old burner

Abandoning a re-house is cheaper than forcing one. Stop and order the module if a clip shears, the housing cracks, a ceramic part breaks, the burner will not seat without pressure, or your photographs do not settle how the old one sat.

The old burner is not general waste. UHP and most high-pressure projector lamps contain mercury and are handled as universal waste in most states, with institutional users under the tighter obligations. Keep the failed lamp in the new lamp's box, avoid breaking it, and route it through a lamp recycler — see recycling and mercury disposal.

Quick reference

• Bare lamp = burner and reflector only; with module = the same burner already in the correct housing.
• Bare is cheaper; module is faster, lower risk, and the right default for a single projector.
• Bonded, welded or one-way-clipped housings and cemented burner-reflector units rule bare out.
• Arc-to-reflector position is factory set in three axes; seat the new burner exactly as the old sat.
• Never touch the quartz with bare fingers; skin oils cause devitrification and early failure.
• Reset lamp hours after any swap, and recycle the old mercury-containing burner.

Frequently asked questions

Is a bare projector lamp the same quality as a lamp with module?

The burner can be identical — the same part, sold without the cage. Quality differences come from the burner's origin, not from whether a housing is attached. An original-burner bare lamp outperforms a fully generic module, so judge a lamp on who made the arc tube, not on packaging.

Will using a bare lamp void my projector warranty?

If the projector is still inside the manufacturer's warranty, use an OEM module and keep the receipt. Re-housing means opening an assembly supplied sealed, which is an easy thing for a claim handler to point at. Out of warranty, the decision is purely cost, risk and your own time.

How do I know if my housing can be opened before I order?

Look at the failed module while it is in your hand. Screws holding a two-part cage, with the burner on separate brackets, usually means it opens. A continuous welded seam, no fasteners, or a burner cemented into the shell means it does not. If you cannot tell, order the module and inspect the old one afterwards.

What happens if I seat the bare lamp slightly wrong?

Small errors cost brightness and evenness — a dim image at full power, or a bright patch and a dark corner. Larger errors dump stray light into the housing as heat, shortening burner life. If the picture looks worse than the old lamp did, recheck seating before blaming the lamp.

Can I clean the new burner if I touch the glass?

Yes, and you should. Wipe the quartz with isopropyl alcohol on a lint-free cloth, let it evaporate fully, and do not power the lamp until dry. That removes skin oils before the first heat cycle bakes them in. Cleaning after it has run with a fingerprint on it will not reverse devitrification.

Order the right lamp the first time

Lamps Authority states the form in every product title, so the suffix tells you what ships: a bare burner, or the complete assembly in its projector-specific housing. Stocking a fleet and happy to do bench work? Bare is the economical route. Room has to work Monday? Take the module. Compare both forms for your model in BenQ projector lamps and Optoma projector lamps, and read OEM vs compatible first.