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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DiCUNO 450pcs 5mm LED Diode, LED Light Kit Box 5 Colors, Mini LED Assorted Kit 5mm Round Top, Light Emitting Diodes for DIY Project, White/Red/Yellow/Green/Blue

DiCUNO 450pcs 5mm LED Diode, LED Light Kit Box 5 Colors, Mini LED Assorted Kit 5mm Round Top, Light Emitting Diodes for DIY Project, White/Red/Yellow/Green/Blue

Product ID: 45516130

Details

Brand
DiCUNO
Bulb Shape Size
B9
Incandescent Equivalent Wattage
100 Watt Hours
Light Type
LED
Special Feature
Energy Super

🌈5 vivid colors included

📐30° focused beam angle

🔆450pcs vibrant LEDs

SAR 82

Duties & taxes included

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Description

💡 Light up your innovation with every color of possibility!

COMPACT ORGANIZED - Slim, durable kit box keeps your LEDs sorted and accessible for instant creativity.
PRO LEVEL VISUAL IMPACT - High luminous intensity LEDs deliver eye-catching signals and effects with ease.
ALL IN ONE DIY POWERHOUSE - 450 premium 5mm LEDs in 5 striking colors ready to elevate your projects.
PRECISION BRIGHTNESS CONTROL - Color-specific forward voltages ensure optimal, vivid illumination every time.
VERSATILE APPLICATION SPECTRUM - Perfect for electronics, car décor, school projects, and professional prototypes.

The DiCUNO 450pcs 5mm LED Diode Kit offers a comprehensive assortment of five vibrant colors—white, red, yellow, green, and blue—each with precise electrical specs and a focused 30° beam angle. Designed for DIY enthusiasts and professionals alike, this compact kit provides high brightness LEDs with color-specific forward voltages, housed in an organized box for seamless project integration across electronics, education, and creative applications.

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	#13,607 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #7 in LED Lamps
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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