Sylvania 58684 90T4Q/CL/AX Starlite Halogen Bi-Pin 90W T4 12V

Product Overview

Sylvania 58684 90T4Q/CL/AX — 90W T4 Starlite Halogen Bi-Pin, 12V, 3000K, GY6.35, 1800 lm

The Sylvania 58684 (90T4Q/CL/AX) is a 90-watt Starlite series low-voltage halogen bi-pin capsule lamp from Sylvania, designed for small-aperture downlighting, display, accent, and task lighting applications using compact T4 low-voltage fixtures. With a GY6.35 bi-pin base, axial filament design, 3000K warm white color temperature, CRI 100, 1800 initial lumens, 4,000 hrs average rated life, UV-stop quartz envelope, and low-pressure construction, this lamp delivers precise directional illumination in a compact T4 capsule body. Suitable for use without lamp containment shielding in 12V applications. Dimmable. Verify voltage, wattage, and base type before ordering.

Wattage

90W

12V / T4

Lumens

1800 lm

Initial Output

Color Temp

3000K

CRI 100

Base

GY6.35

Bi-Pin

Rated Life

4,000 hrs

Average Life

Technical Specifications

Brand	Sylvania — Starlite
NAED / Item Number	58684
Ordering Abbreviation	90T4Q/CL/AX
Lamp Type	Low-Voltage Halogen Bi-Pin Capsule — Starlite (Axial Filament)
Bulb Shape	T4 (Clear)
Base Type	GY6.35 Bi-Pin
Voltage	12V
Wattage	90W
Initial Lumens	1800 lm
Color Temperature	3000K Warm White
CRI	100
Filament Design	Axial (parallel to lamp axis — optimum directional light output)
Envelope / Glass	UV-stop quartz (reduces UV-B and UV-C by ~90% vs. standard quartz)
Pressure Type	Low pressure — suitable for use without lamp containment shielding*
Dimmable	Yes (with compatible transformer and dimmer)
Rated Average Life	4,000 hrs
Max Overall Length (MOL)	1.75"
Diameter	12mm
Mercury Content	Mercury-free — halogen lamp

*Consult current UL standards for specific luminaire requirements.

Product Overview

The Sylvania Starlite series uses an axial filament design — the filament runs parallel to the lamp axis rather than perpendicular to it. This orientation allows the lamp to act as a near-point light source when placed at the focal point of a reflector, producing a well-defined, evenly distributed beam with minimal hot spots. The result is smooth, accurate directional light from a very compact lamp body, suited to small-aperture downlights, display cases, accent fixtures, and task lighting equipment where precise optical control matters.

All Sylvania Starlite bi-pin lamps use advanced UV-stop quartz that reduces UV-B and UV-C radiation by approximately 90% compared to regular quartz, providing extra fade protection for light-sensitive merchandise and materials. The low-pressure construction of 6V and 12V variants means these lamps can be operated without lamp containment shielding (consult current UL standards for specific luminaire requirements). At CRI 100, these lamps deliver full-spectrum color rendering identical to natural incandescent light, with no color distortion on any material or finish.

Compatible Applications

Small-aperture downlighting — Compact T3/T4 body with axial filament for tight optical systems in miniature recessed and surface-mounted downlights.
Accent strip lighting — Low-voltage bi-pin capsule format for architectural accent and cove lighting fixtures.
Display lighting — CRI 100 and UV-stop quartz protect light-sensitive merchandise while delivering accurate color rendering.
Task lighting — Dimmable operation for adjustable task and desktop lighting applications.
Residential, commercial, and industrial bi-pin applications — Where compatible fixtures are specified.

Before Ordering — Verify

Voltage: Confirm fixture is rated for the correct supply voltage — 6V and 12V Starlite lamps are low-pressure and may be used without lamp containment shielding; 24V Starlite lamps are high-pressure and require a suitable protective shield.
Base Type: Confirm fixture socket matches the lamp's base type (G4 for T3 lamps; GY6.35 for T4 lamps).
Wattage: Confirm fixture is rated for the specific wattage of this lamp.
Transformer Compatibility: Low-voltage bi-pin lamps require a compatible 12V (or 6V) electronic or magnetic transformer. Confirm transformer wattage capacity covers the total connected load.
Dimming: If dimming is required, confirm transformer and dimmer are compatible with halogen bi-pin loads.
Physical Fit: Verify the lamp's MOL and diameter fit within the fixture's lamp compartment.

Safety and Handling Guidelines

Do not touch the quartz capsule with bare hands. Skin oils cause hot spots leading to premature failure. Use clean gloves or a lint-free cloth. If accidentally touched, clean with rubbing alcohol before energizing.
Allow Cooling: Allow the lamp to cool fully before handling or replacement — low-voltage halogen capsules reach high surface temperatures during operation.
Disconnect Power: Turn off and isolate the transformer before lamp replacement.
24V Lamps — Shielding Required: Unlike 6V and 12V Starlite lamps, 24V versions are high-pressure capsules and require a suitable protective shield in the fixture.

Compliance

Mercury-free tungsten halogen lamp — no mercury-related shipping restrictions apply.
UV-stop quartz reduces UV-B and UV-C emissions by approximately 90% versus regular quartz.
Verify RoHS compliance status with the Sylvania manufacturer specification sheet prior to use in regulated installations.