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

5mm Colored Led Diode | Desertcart KUWAIT

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Description

✨ Light up your projects with brilliance and color! 🌈

COMPACT ORGANIZED - Comes in a sleek kit box for easy storage and quick access during your DIY builds.
DIY READY VERSATILITY - Perfect for electronics, car décor, science experiments, and signal indicators—ignite your creativity now.
VIBRANT 5 COLOR SPECTRUM - Includes 90 LEDs each of Red, Yellow, Green, Blue, and White for versatile lighting projects.
OPTIMIZED ELECTRICAL SPECS - Designed with ideal forward voltages (2.0-3.2V) and 20mA max current for efficient, long-lasting performance.
PRECISION BRIGHTNESS CONTROL - Super bright LEDs with luminous intensity up to 20,000mcd for eye-catching illumination.

The DiCUNO 450pcs 5mm LED Diode Kit offers a professional-grade assortment of five vibrant colors, each with precise electrical parameters and high luminous intensity. Packaged in a compact box, these energy-efficient LEDs deliver focused 30° beams at 20mA max current, making them ideal for DIY electronics, educational experiments, and creative lighting solutions.

Specifications

ASIN	B073QMYKDM
Accepted Voltage Frequency	220 to 240 Volts and 50 Hertz
Additional Features	Energy Efficient, Super bright
Beam Angle	30 Degrees
Best Sellers Rank	#10,156 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #4 in LED Lamps #4 in Diodes #3,186 in Electrical Equipment
Brand Name	DiCUNO
Bulb Shape Size	B9
Color	White, Red, Yellow, Green, Blue
Color Temperature	8000 Kelvin
Connectivity Technology	Normal bulb
Control Method	App
Controller Type	Push Button
Customer Reviews	4.7 4.7 out of 5 stars (2,479)
Efficiency	High
Incandescent Equivalent Wattage	100 Watt Hours
Included Components	LED Diodes, Kit Box
Indoor Outdoor Usage	Indoor
Item Dimensions W x H	0.91"W x 3.66"H
Item Weight	170 Grams
Light Color	Blue
Light Source Type	LED
Light Source Wattage	0.06 Watts
Light Type	LED
Manufacturer	DiCUNO
Manufacturer Part Number	5C-5MM 450 L
Material Type	Plastic
Model Name	5C-5MM
Model Number	5C-5MM 450 L
Number of Items	1
Package Quantity	1
Power Source	AC adapter
Shape	Round
Specific Uses For Product	Indicator lights
Style Name	Modern
UPC	606046645177
Unit Count	450.0 Count
Voltage	2 Volts
White Brightness	2000 Lumens

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