One standard article of all signs and led coaxial light source need some method of illumination. Also, to meet recognized guidelines for alternative signage, exit, and spare signs essential to be either within illuminated or offer illumination for up to 90 minutes. So, here are some of the general methods of illumination and some of their pros and cons.
Methods of Illumination
Here are some of the illuminations methods.
1. Cold Cathode Lighting
Cold Cathode lamps have light via the fluorescence that arises when UV radiation from a mercury arc excited a phosphor coating in a glass tube. Cold cathode lamps are the same as fluorescent lamps, though the cathode is a warm or incandescent filament in fluorescent lamps. The cathode doesn’t electrically heat in a cold cathode lamp. Some of the examples include Cold Cathode Fluorescent Lamps (CCFL) and Neon Lamps.
- Highly Efficient (Low Heat Output)
- Instant On
- Tolerates Low Temperatures
- No Flicker
- Long Life
- Risky Low Temperature Shortens Lamp Life
2. Electroluminescent (LEC) Lighting
Electroluminescent lighting occurs when an electronic current or robust electric field passes by certain materials, mainly through semiconductors. Some examples of this type of lighting include Light Emitting Capacitors (LEC) and Light Emitting Diodes (LED).
- They are energy efficient
- They have a long life
- Dense Light Output Limits Uses
3. Fluorescent Lighting
Fluorescent lamps occur light through the fluorescence that happens by UV radiation from a mercury arc when a phosphor coating in a glass tube is excited. They function likewise to cold cathode lamps, though the cathode is a a hot or incandescent filament in fluorescent lamps. It is highly versatile in Linear Fluorescent Lamps (LFL) and Compact Fluorescent Lamps (CFL).
- Long Lamp Life
- Low Operating Cost
- Lower CRI Than Other Light Sources
- More Complex Engineering Requires Ballast (Included)
4. Halogen Lighting
Halogen lamps also have light via incandescence. Though, halogen lamps have superior competence and longer life span. It has the filament bordered by a halogen gas, which permits it to function at a higher temperature (generating more light) and shields it against “filament evaporation.” It is helpful in MR16 & PAR Sealed Beam Lamps.
- High Color Rendering Index (CRI)
- Crisp White Light
- Instant On
- Low Efficiency (High Heat Output)
5. High Intensity Discharge (HID) Lighting
LED coaxial light source high-Intensity Discharge (HID) lamps yield light from the electric arc discharge, which happens when the vapor and metallic salts in a transparent arc tube are ionized by vibrating a high voltage across the lamp among two tungsten electrodes. HID lamps are far more lumen effective than fluorescent or incandescent lamps as a more substantial proportion of their radiant energy is visible light. They are helpful in multiple applications, like Metal Halide Lamps, Mercury Vapor Lamps, Ceramic Metal halides, Low-Pressure Sodium Lamps, High-Pressure Sodium Lamps, & Xenon Short-Arc Lamps.
- Long Life
- High Lumen Efficiency (More Light than Heat)
- Higher UV Output
- Requires Ballast (Included)
- Not Instant On