What consumer notices is the true and false that should differentiate certificate seriously, the manufacturer that has international safety attestation and national LED qualification certificate is not much. From the health aspect, the product price that USES nontoxic material to design wants high.
White 7seg Display Seven Segment
LED 2.3 inch 2.3" 1 Digit Single CA CC
Orange Seven Segment LED Display
0.36 inch 0.36" Four Digit 4 Common Anode
Green 7 Segment LED Display
1.8 inch 1.80" Single Digit 1 7-seg CC CA
Red Ultra Bright LED 7
Segment Display 0.28 inch Four Digit Common Anode CA
White 7seg Display Seven Segment
LED 0.52 inch 0.52" 3 Digit Three CA CC
Red Ultra Bright LED 7
Segment Display 0.28 inch Dual Digit Common Anode CA
Orange Seven Segment LED Display
0.31 inch 0.31" Three Digit 3 Common Anode
Yellow Green LED 7 Segment
0.39 inch 3 Digit Three Display Common Cathode CC
Green 8x8 LED Matrix Display
Dot Diameter 3.7mm 1.5" Common Cathode
White Seven Segment LED Display
7segs 1Digit Single 0.3 inch Common-Anode CA Common-Cathode CC
One type: LED energy-saving lamp made of straw hat type low power LED, power supply adopts resistance-capacitance step-down circuit. Straw hat LED is extended by the packaging form of indicator LED, which is encapsulated with epoxy resin, so that the LED chip can not emit heat, and the light decay is serious. Many white LEDs, after using for a period of time, the color temperature becomes high, and gradually becomes blue and dim.
3202AGG LED
3202AGG 7-Segment
3202BGG Display
3202BGG 0.30 inch
In addition to the continuous development of technology, high-power LED also continues to appear, such as 0.5W LED(IF=150MA), 1W LED(IF=350MA), 3W LED(IF=750MA) and other more specifications, I will not introduce one, you can go to the LED manual. LED voltage: Usually the LED is the positive voltage, that is, the positive pole of the LED is connected to the positive pole of the power supply, the negative pole is connected to the negative pole of the power supply. Voltage is related to color, red, yellow, yellow green voltage is between 1.8-2.4V.
3941AW LED
3941AW 0.39 inch
3941BW 7-Segment
3941BW Display
Each pixel has its own hardware to control them, which is more efficient than the current standard. Each smart pixel LED can be individually dimmed for output, and their beam can be controlled more precisely. That is, a better dark spot can be formed against oncoming cars to mimic a mechanical "corner lighting" system. Digital headlight LEDs project illuminated signs, including zebra crossings, stop signs, and guidance signs, onto the road. The intelligent "pixel" LED beam modulation technology used in this new system is called digital headlights.
Red
3651AW LED
3651AW 5-digit
3651BW Segment
3651BW 
