Cap names describe mechanical interfaces; they do not guarantee that a bulb’s voltage, size, output or dimming behaviour suits the fitting.
Start with the problem, not the product photograph
Electrical compatibility and visual quality are different questions. For E27, E14 and bayonet caps explained, begin at the rating label and finish with a documented trial.
Photograph the proposed position straight on and from the side. Record the full dimensions, lampholder, bulb, connection method and the main task. A close product image rarely shows room scale, door movement or the angle from which a bare bulb becomes visible.
Three distinct decisions
1. Decide the job before the style
Photograph the old bulb and lampholder marking, and match the cap without forcing or using an improvised adapter.
Keep this evidence: write the main task and the one constraint that could rule the fitting out.
2. Measure the real fitting envelope
Record thread diameter or pin arrangement, bulb envelope, supply rating and the manufacturer’s maximum wattage.
Keep this evidence: record every dimension from one named reference point and photograph the tape measure in place.
3. Test the result from normal positions
Fit only with power off and confirm secure seating, adequate clearance and normal switching before judging light quality.
Keep this evidence: repeat the check by day and after dark, using the bulb and furniture layout you expect to keep.
Compare two models without being misled by the image
| Evidence | Why it matters | Practical check |
|---|---|---|
| Complete dimensions and weight | Glass, base, chain and canopy may sit outside the highlighted shade dimension. | Dimensioned sketch, total weight and a 1:1 mock-up |
| Connection and bulb | Voltage, plug or fixed connection, bulb count, cap, lumens, shape and maximum wattage affect suitability. | Rating label, current product page and trial with the intended compatible LED |
| Switched off and on | Dense stained glass can glow strongly at night yet read much darker in daylight. | Compare from the same angle in the actual room |
A real TiffanyLight.co.nz product as the worked case
Red dragonfly Tiffany-style desk lamp
A small red dragonfly shade used for bedside, desk, motif-scale and bulb-position examples.
This model demonstrates the method; it is not an automatic recommendation. Draw its complete dimensions, verify the current electrical specification and test the proposed light in the real room. Product details can change, so check the live page before buying.
Confirm on the product page: total dimensions, weight, voltage and connection, lampholder, maximum wattage, included parts and installation conditions.
Practical New Zealand home scenario
Photograph the fitting label and compare two compatible LEDs where only one property changes. Confirm the globe fits, remains clear of glass and is hidden from normal view. Record the exact bulb model that gives the most stable, useful result.
Common mistakes
- Guessing the bulb cap or voltage from a photograph.
- Confusing watts, lumens, lux and kelvin.
- Assuming every dimmable LED works with every dimmer.
Final checklist
- The fitting label has been read.
- Voltage and maximum wattage are respected.
- The globe fits without contact.
- Lumens, kelvin and CRI are recorded.
- Dimming is stable across the useful range.
Record sheet: model, complete dimensions, total weight, voltage and connection, lampholder, chosen LED, position, mock-up photograph and check date. The current product information and maker’s instructions take priority over general guidance.
Explore relevant lamps
Tiffany table lamps · Tiffany floor lamps · Tiffany pendant lights · Tiffany wall lights · Tiffany flush lights · Tiffany chandeliers