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.

Brand	Ruiandsion
Light Type	LED
Special Feature	Super Bright
Wattage	2 watts
Bulb Shape Size	B9
Bulb Base	E10
Incandescent Equivalent Wattage	10 Watts
Specific Uses For Product	Lamp
Light Color	White
Voltage	3 Volts
Unit Count	2 Count
Color Temperature	6000 Kelvin
Number of Items	1
Brightness	150 Lumen
Shape	Bulb
Material	Acrylonitrile Butadiene Styrene (ABS)
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
Item Weight	0.01 Kilograms
Light Source Wattage	2 Watts
Product Dimensions	0.47"W x 1.22"H
Control Method	App
Average Life	50000 Hours
White Brightness	150 Lumens
Efficiency	75 lumens/watt
Style	3V
Manufacturer	Guangzhou Ruixin Lighting Technology Co., Ltd.
Color	White
Light Output Maximum	150 Lumens
Part Number	FHE10-COB-2W-Hua-W-3V*2
Item Weight	0.317 ounces
Item model number	E10
Finish types	White
Special Features	Super Bright
Batteries Included?	No
Batteries Required?	No
Wattage	2 Watts

Ruiandsion 2pcs 2W COB 3V E10 Base LED Upgrade Bulb Replacement for Flashlights Torch LED Light, White

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