Which is the cold cathode lamp?

Which is the cold cathode lamp?

A cold cathode fluorescent lamp (CCFL) is a lighting system that uses two phenomena: electron discharge and fluorescence. CCFLs are mainly used as light sources for backlights, because they are smaller and have longer lifetimes than ordinary fluorescent lamps.

Is led cold cathode?

When considering using a Cold Cathode Fluorescent light bulb for your project, keep in mind that they can be used as a direct replacement for incandescent bulbs in many applications, and will reduce energy costs in such situations drastically.

How do you test a CCFL lamp?

IF YOU ARE NOT SURE WHICH ONE IS THE SUPPLY LINE WHEN YOU FIRST FIND YOUR OWN KNOW GOOD INVERTER JUST PUT THE BLACK PROBE TO THE GROUND HOLE SCREW AND TOUCH THE RED PROBE TO EACH PIN ONE AT A TIME UNTIL YOU SEE THE LCD SCREEN CCFL BULB LIGHT.

How do cold cathode fluorescent lamps work?

A cold cathode lamp functions by using electricity emitted from cathodes to excite mercury vapors using the process of inelastic scattering in order to create fluorescence, just as a typical linear fluorescent does.

What’s the difference between cold cathode and neon?

In the lighting industry, “cold cathode” historically refers to luminous tubing larger than 20 mm in diameter and operating on a current of 120 to 240 milliamperes. The term “neon lamp” refers to tubing that is smaller than 15 mm in diameter and typically operates at approximately 40 milliamperes.

What is cold cathode tube?

Definition of cold cathode : a cathode in an electron tube or fluorescent lamp that is unheated and that emits electrons when bombarded by ions or subjected to light, infrared, or ultraviolet rays cold-cathode tube.

Are neon lamps cold cathode lamps?

Lamps. Cold-cathode lamps include cold-cathode fluorescent lamps (CCFLs) and neon lamps. Neon lamps primarily rely on excitation of gas molecules to emit light; CCFLs use a discharge in mercury vapor to develop ultraviolet light, which in turn causes a fluorescent coating on the inside of the lamp to emit visible light …

Is CCFL better than LED?

LED (light-emitting diodes) is the newer type of LCD backlight which has become predominantly the primary LCD backlight source in LCD monitors today. LED backlights are better than CCFL as they are brighter, they take less energy, and LEDs last longer.

How many volts does a CCFL need?

A CCFL requires a high AC voltage (typically 600 VRMS) for normal operation, and can require a current of 2–6 mARMS, depending on the brightness level.

What is the working principle of fluorescent lamp?

Principles of operation A fluorescent lamp generates light from collisions in a hot gas (‘plasma’) of free accelerated electrons with atoms– typically mercury – in which electrons are bumped up to higher energy levels and then fall back while emitting at two UV emission lines (254 nm and 185 nm).

What is the voltage required to start a fluorescent lamp?

Fluorescent starter: Fluorescent starters are a timed switch and it provides ignition voltage to the fluorescent lamp. The ignition voltage is as high as 1000 V to initiate a discharge in the argon gas lying between electrodes.

What is a cold cathode fluorescent lamp?

Cold Cathode Fluorescent Lamps (CCFLs) require low power consumption and are widely used in machine vision, image scanning and task lighting as well as for extensive use in backlighting LCD screens. Available in diameters as small as 2mm, the CCFL’s provide for a space saving solution with uniform light output.

What kind of light is used in a flatbed scanner?

These scanners use a fluorescent lamp and a CCD array as light source and detector, respectively. Recently, manufacturers of flatbed scanners replaced the fluorescent lamp by light emission diodes (LED) as a light source.

What is a CCFL lamp used for?

CCFL Lamps. Cold Cathode Fluorescent Lamps (CCFLs) require low power consumption and are widely used in machine vision, image scanning and task lighting as well as for extensive use in backlighting LCD screens. Available in diameters as small as 2mm, the CCFL’s provide for a space saving solution with uniform light output.

Is the performance of the led flatbed scanner comparable to CCFL?

In overall, the performance of the LED flatbed scanner is comparable to that of a cold cathode fluorescent lamp (CCFL). There are important spectral differences between LED and CCFL lamps that results in a higher sensitivity of the LED scanner in the green channel.