What is the width of the G4 T3 3 watt (30W equivalent)?

Thank you for you question! the width of two pin is 4mm;and it is 30W equivalent

I am replacing 18 halogens with these ukey 3w dimmable leds. does anyone have a recommendation on a dimmable transformer i should obtain?

I’ve had a good experience with this one. I’ve mounted the box on top of a cabinet and I aim the remote at the ceiling. The dial adjusts the overall power and the remote has a 15 sec. exit feature. I have three of these and they’ve been working well for over 6 yrs. LED Wholesalers PWM Dimmer for LED Lighting with 12 Button Wireless Remote 12 to 24 Volt 6 amp, 3317-DM For some bizarre reason, Amazon won’t let me post the link to an item they sell for LED Wholesalers. Good luck with your retrofit.

Will these bulbs work with a typical halogen transformer? such as https://www.amazon.com/let-60-class-electronic-transformer-lightech/dp/b002rsouls/

Based on the specs, it should work just fine.

will 7 volts ac light this bulb

I don't know. The packaging says 12v acdc. I use them with a 12vac system. The apparently have a integral rectefier in the circuitry, as the LED's are dc. Try a adjustable power supply. 7 volts? It sounds like you are connecting them to 2 18650's? Watch your current.

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G4 LED Bulb 3Watt Bi-Pin Base 12V AC/DC 2700K Warm White Dimmable

G4 LED Bulb 3Watt Bi-Pin Base 12V AC/DC 2700K Warm White Dimmable

Product ID: 43361957

Details

Brand
Ukey U
Bulb Shape Size
JC
Light Type
LED
Special Feature
2700K color On
Wattage
3 watts

💡3W ultra-efficient power

🔆300 lumens bright output

♻️90% energy savings

Description

💡 Light smarter, live brighter — the future of cozy, eco-friendly illumination!

360 RADIANCE - COB LED chip delivers a full 360-degree beam angle for seamless, even lighting.
LONG LASTING GLOW - Over 20,000 hours lifespan means fewer replacements and less hassle.
PLUG PLAY UPGRADE - Standard G4 base fits instantly—dimmable and ready to transform your space.
BRILLIANT EFFICIENCY - Replace 30W halogen with just 3W and save over 90% on your electricity bill.
WARM AMBIANCE ZERO HARM - 2700K warm white glow with no UV/IR radiation—safe for your eyes and health.

The G4 LED Bulb 3W is a high-efficiency, dimmable warm white light source designed to replace traditional 30W halogen bulbs. Operating at 12V AC/DC with a 360° beam angle and 2700K color temperature, it delivers 300 lumens of flicker-free, eye-safe illumination. With an impressive 20,000-hour lifespan and over 90% energy savings, this waterproof T3 bulb is perfect for indoor G4 socket fixtures, offering effortless installation and eco-friendly performance in a convenient 5-pack.

Specifications

ASIN	B06XQKPG13
Additional Features	2700K color temperature, Dimmable, Instant On, No UV or IR Radiation, No lead or mercury
Beam Angle	360 degrees
Best Sellers Rank	#523,923 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #16,431 in LED Bulbs
Brand Name	Ukey U
Bulb Base	G4
Bulb Shape Size	JC
Color	Clear
Color Rendering Index	85
Color Temperature	2700 Kelvin
Connectivity Technology	Normal bulb
Control Method	App
Controller Type	Push Button
Customer Reviews	3.4 3.4 out of 5 stars (75)
Efficiency	A+
Incandescent Equivalent Wattage	30 watts
Indoor Outdoor Usage	Indoor
Light Color	Warm white
Light Source Operating Life	20000 hours
Light Source Type	Light Emitting Diode (LED)
Light Source Wattage	3 watts
Light Type	LED
Manufacturer	Ukey U
Manufacturer Part Number	UL005
Material Type	copper
Number of Items	1
Package Quantity	5
Power Consumption	3 watts
Power Source	Corded Electric
Shape	Bulb
Specific Uses For Product	G4 Socket all lights
Specification Met	ETL
Style Name	LED
UPC	636823479800
Unit Count	5 Count
Voltage	12 volts
Wattage	3 watts
White Brightness	300 lumens

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