LED retrofit check
Can this lamp be replaced with LED?
A matching base is only the start. The existing power system, controls, available space and fixture environment decide whether the LED is a direct replacement.
Simple screw-in incandescent replacements are often direct when the ratings match. Low-voltage halogen, fluorescent, plug-in CFL and HID systems may depend on a transformer, ballast, driver or rewiring method.
| Existing lamp | Proposed LED | Likely result | What still decides |
|---|---|---|---|
| A19 incandescent | A19 LED with matching base and voltage | Usually direct | Lumens, fixture watt limit, dimmer and enclosure rating |
| G9 halogen capsule | G9 LED | Conditional | Voltage, loop contacts, dimensions, dimmer and enclosed-fixture rating |
| G4 halogen capsule | G4 LED | Conditional | 4 mm pins, AC/DC output, transformer minimum load and clearance |
| GU10 halogen | GU10 LED | Often direct | Printed voltage, diameter, length, beam angle and dimmer |
| GU5.3 MR16 halogen | GU5.3 MR16 LED | Transformer-dependent | 12 V AC/DC, transformer load range, beam and dimensions |
| T8 fluorescent | T8 LED tube | Wiring-specific | Ballast-compatible, ballast-bypass, hybrid or external-driver instructions |
| Plug-in CFL | Plug-in LED | Base suffix and ballast-specific | Full keyed base code, ballast model, orientation and rewiring instructions |
| HPS or metal-halide lamp | HID LED retrofit | Luminaire-specific | Ballast compatibility or bypass, socket, voltage, thermal space and listing |
| Oven incandescent/halogen | General LED | Usually no | Use only a model-supported high-temperature lamp |
| Integrated LED board | Generic bulb | No direct bulb match | Use fixture/appliance model and manufacturer module part |
Same electrical system
The base, voltage, dimensions and fixture ratings match, and no external ballast or transformer compatibility problem remains.
Check control gear
The LED manufacturer explicitly supports the installed transformer, ballast, dimmer or sensor—or supplies documented conversion instructions.
Do not guess at wiring
An integrated module, damaged socket, unknown voltage or undocumented bypass needs the fixture model or a qualified person.
Build a replacement brief
Record every known value and leave missing values visible before shopping.
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