Would this bulb work for a 5 cell flashlight ? 7.5v

I doubt it seriously. These are like miniature night light bulbs. I got these to replace the incandescent bulb used in a rock crystal lamp. Very low light output.

Are they dimmable (thru a rheostat)? [Using 3 AA batteries/1.5v]

Lowering the voltage will dim the bulb, tho I don't know how well a r/stat would work ? (on a DC lamp) at such a low voltage, and almost no amps !

will these work in a 6v lantern?

I ordered this bulb specifically for an old lantern that uses the recrangylar 6v battery. They DO NOT work in the lantern I have. The old bulb works so I know the battery is good. The base is bottoming out as well. Not sure why it will not work. Tried both new bulbs as well.

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Description

💡 Light up your world with brilliance and efficiency!

EFFORTLESS UPGRADE - Simple twist-and-replace design—no tools, no hassle, just instant flashlight revival.
ENERGY SAVVY POWER - Runs on a low 3V voltage, maximizing battery life without compromising brightness.
BRILLIANT ILLUMINATION - 150 lumens of crisp, white light to brighten your every adventure.
PEACE OF MIND WARRANTY - 12-month hassle-free replacement guarantee keeps you shining worry-free.
DURABILITY MEETS PERFORMANCE - Built with heat-resistant COB LEDs ensuring consistent brightness even under heavy use.

The Ruiandsion E10 Base LED Upgrade Bulb delivers a powerful 150-lumen white light at just 2 watts and 3 volts, designed to replace traditional flashlight bulbs effortlessly. Featuring a compact 31x12mm size and a durable COB LED that withstands heat, it offers an impressive 50,000-hour lifespan and a 360-degree beam angle. Perfect for portable lighting needs, this energy-efficient bulb comes with a 12-month warranty, ensuring reliable, super bright illumination wherever you go.

Specifications

Brand	Ruiandsion
Light Type	LED
Special Feature	Super Bright
Wattage	2 watts
Bulb Shape Size	B9
Bulb Base	E10
Incandescent Equivalent Wattage	1E+1 Watts
Specific Uses For Product	Portable Lighting
Light Color	White
Voltage	3 Volts
Unit Count	2 Count
Color Temperature	6000 Kelvin
Number of Items	1
Brightness	150 Lumen
Shape	Bulb
Material	copper
Connectivity Technology	Normal bulb
Controller Type	Push Button
Theme	Portable Lighting
Included Components	2 x E10 LED Bulbs
Power Source	DC power supply
Color Rendering Index	80
Beam Angle	360 Degrees
Power Consumption	2 Watts
Item Package Quantity	1
Light Source Type	led
Light Source Wattage	2 Watts
Product Dimensions	0.47"W x 1.22"H
Control Method	App
Average Life	5E+4 Hours
White Brightness	150 Lumens
Efficiency	75 lumens/watt
Style	3V
Manufacturer	Guangzhou Ruixin Lighting Technology Co., Ltd.
Part Number	FHE10-COB-2W-Hua-W-3V*2
Item Weight	0.317 ounces
Item model number	E10
Color	White
Finish types	White
Special Features	Super Bright
Batteries Included?	No
Batteries Required?	No
Wattage	2 Watts