Can these bulbs be used to replace the christmas led of the 5mm that are concave style?

... Depends entirely on the specifics of the "Christmas LED" (and what you mean by "concave style"). If the original string shares the same electrical characteristics as these, then sure--but there's no way to randomly guess what kind of LEDs you're trying to replace.

Do you have leds of 1.5 volts available?

I do not have any but there might be some out there. Try DigiKey or Mouser electronics.

Can I use a 9v battery

Dear customer, voltage range of these diodes are: R/Y 2.0-2.2V; B/G/W 3.0-3.2V. 9v battery could only be used with proper resistors. Thank you for asking and hope this answer could be helpful.

These + a 2-3 volt DC button battery and it lights up? Aside from a switch and the connections, anything else needed?

depends on the purpose of your use of the LED. I used several to illuminate a model r/c airplane with two 1.5 AAA batteries and an off and on switch. They can be soldered together plus to minus leads in series or connected by lengths of wire. Note: some require different voltages identified on the container lid

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描述

⚡ Light up your genius with every color in the box!

MULTI USE MAGIC - Perfect for tech innovators, hobbyists, and pros—ideal in electronics, car décor, and science experiments.
READY TO GO DIY KIT - Compact box keeps your LEDs sorted and accessible—no more mix-ups or lost pieces.
PRECISION ENGINEERING - 5mm round top LEDs with 30° beam angle ensure focused, high-impact illumination.
BRILLIANT SPECTRUM POWER - 5 colors x 90 LEDs deliver vibrant, precise lighting for any creative project.
ENERGY SMART PERFORMANCE - Low forward voltage (2.0-3.2V) and max 20mA current for efficient, long-lasting use.

The DiCUNO 450pcs 5mm LED Diode Kit offers a professional-grade assortment of super bright LEDs in five vivid colors, each with precise voltage and brightness specs. Packaged in a smart sorting box, this kit is engineered for DIY enthusiasts and professionals alike, delivering focused 30° beam angles and energy-efficient performance across a wide range of creative and technical applications.

规格

Brand	DiCUNO
Light Type	LED
Special Feature	▲ Super bright 5mm LED, 450 pcs (5 color * 90 pcs) <br> ▲ Mark color and voltage clearly in label. <br> ▲ Box Kit for sorting. Don’t worry you will mix them up or lose them. <br> ▲ Widely applied to DIY LED Projects, School Science Experiments, Car Decorations, etc.
Bulb Shape Size	B9
Incandescent Equivalent Wattage	100 Watt Hours
Specific Uses For Product	Indicator lights
Light Color	Blue
Voltage	2 Volts
Unit Count	450.0 Count
Color Temperature	8000 Kelvin
Number of Items	1
Brightness	2000 Lumen
Shape	Round
Material	Plastic
Connectivity Technology	Normal bulb
Controller Type	Push Button
Beam Angle	30 Degrees
Power Consumption	27 Watts
Item Package Quantity	1
Light Source Type	LED
Item Weight	170 Grams
Product Dimensions	0.91"W x 3.66"H
Control Method	App
Manufacturer	DiCUNO
UPC	606046645177
Part Number	5C-5MM 450 L
Item Weight	6 ounces
Country of Origin	China
Item model number	5C-5MM 450 L
Is Discontinued By Manufacturer	No
Size	450 Count (Pack of 1)
Color	White, Red, Yellow, Green, Blue
Finish	Plastic
Special Features	▲ Super bright 5mm LED, 450 pcs (5 color * 90 pcs) <br> ▲ Mark color and voltage clearly in label. <br> ▲ Box Kit for sorting. Don’t worry you will mix them up or lose them. <br> ▲ Widely applied to DIY LED Projects, School Science Experiments, Car Decorations, etc.
Batteries Included?	No
Batteries Required?	No