LEP in Underground Space

I. Characteristics of the Underground Confined Space Series LEP light source

1.1. Characteristics of LEP spectrum

LEP is the continuous spectrum closest to sunlight. The proportion of the red, green and blue spectrum of LEP light source is almost the same as that of sunlight, which is a continuous full spectrum. In addition, the color temperature of LEP is the same as that of natural light. The illuminated objects are displayed as clearly as in the daytime sunlight. It has the characteristics of excellent color rendering, constant color temperature, extremely low light decay, no flicker, high brightness, strong fog penetration, energy saving and high efficiency. Therefore, LEP light source is very friendly to human eye health.

• Beneficial: The infrared and ultraviolet light in LEP light sources can enhance immunity, prevent osteoporosis, benefit physical and mental health, and kill bacteria;

• Comfortable: The light color of LEP light sources is consistent with that of natural light, with excellent color rendering, no flicker, and no glare;

• Reliable: After 50,000 hours of use, the light efficiency of LEP light sources remains above 80%, and the color temperature remains constant;

• Energy saving: LEP light efficiency is 40% higher than HID; in high lumen applications, LEP costs less than LED.

The LEP light source for underground confined space series is a continuous full-spectrum white light, with a spectral wavelength range of 295nm-1800nm. The ultraviolet light and infrared light in the LEP light source are the same as sunlight, which has the benefits of improving the immunity of workers who work in underground spaces for a long time, antibacterial effects, improving skin health, promoting the synthesis of various vitamins in the body, promoting blood circulation, accelerating metabolism, benefiting human eye health, and benefiting physical and mental health. LEP is the continuous spectrum closest to sunlight, with a color temperature of 4500K-6000K, invisible light accounting for 30%, visible light accounting for 70%, and the red, green and blue proportions of the visible light part are 41/32/27, which is almost the same as sunlight. The proportion of each wavelength in the spectrum is very close to the spectrum of sunlight, as shown in the table below:

Comparison between sunlight and several commonly used electric light sources

1.2. Physical characteristics of LEP light source

LEP light sources all use high-purity quartz bulbs with extremely high light transmittance. They are resistant to high temperatures and can be used for a long time at 1100°C without bursting. Their safety performance is higher than that of ceramic glass bulbs.

With excellent natural heat dissipation performance, the integrated LEP light source (including amplifier, power supply and lamp holder) can keep the temperature as low as 58℃ (room temperature @ 32℃) during long-term operation.

The radiant heat of LEP light source during operation is significantly lower than that of LED.

1.3. Application advantages of the Underground Confined Space Series LEP

Underground work space lighting:

LEP light source is very suitable for underground command centers, underground arsenals, underground warehouses, underground launch control centers, underground bunkers, etc. It can enhance immunity, enhance vitality, be beneficial to physical and mental health, and improve combat effectiveness.

Long-term absence of sunlight can cause melatonin secretion disorders, vitamin D deficiency, physical decline, affect the biological clock and sleep quality, increase the risk of depression, irritability, affect skin health, vision decline, etc. LEP light source provides a comfortable all-weather sunlight lighting environment, which is of great benefit to the physical and mental health of personnel in confined spaces, improves personnel's concentration and combat effectiveness, and can effectively improve psychological problems such as depression and anxiety caused by long-term absence of sunlight.

The power density of the LEP light source of LEP-S-300-V25095-03 reaches above AM1.5 (≥1000W/m²), the irradiation intensity reaches above 1.0Sun, the light energy reaches 24285lm, and the light energy efficiency reaches 97.77lm/w. The spectrum matching, irradiation stability and irradiation uniformity with sunlight can reach the AAA level of the international standard for solar simulators. After 50,000 hours of continuous use, the luminous flux still remains above 80%.

II. Technical parameters of the Underground Command Center Series LEP light source

2.1. Parameters of the Underground Command Center Series LEP light source

Product model	LEP-S-300-V25095-03
Product series	Underground Confined Space Series LEP Light Source
Spectral range	295 nm-1800 nm
Initial luminous flux	18000 lm
Luminous flux efficiency	72 lm/w
Luminous energy	25714 （lm）
Luminous energy efficiency	103 （lm/w）
CCT	5000K
CRI	95
service life	50000h (≥80%)
AC power	270 W
DC voltage	28 V
Direct current	8.9 A
Dimming control	Customizable
Light output direction	Down ± 30
Intelligent switch	Supported
Opening time	30-60 seconds
Restart time	90-180 seconds (restart automatic protection)
Total weight	3.7kg (lamp head+microwave solid-state source+power supply+connector)
Outer packaging size	L*W*H: 510*240*110mm
Typical spectra (customizable)
Optical output distribution characteristics

2.2 Environmental requirements for LEP light sources

A) Work Environment

Temperature -25℃ to +45℃, humidity 5%-95%.

B) Storage environment temperature

Temperature -40℃ to +80℃, humidity 5%-95%.

2.3. Heat dissipation requirements of LEP light sources

A) Power supply cooling

If the LEP power supply is external, the power supply shell itself can meet the heat dissipation requirements. If the power supply is built-in, the heat dissipation must meet the requirement that the temperature rise is less than 35°C under a 25W heat source.

B) Power amplifier heat dissipation

The power amplifier (microwave solid-state source) must meet the requirement that the temperature rise is less than 35°C under an 80W heat source.

C) System cooling

When the ambient temperature is 30°C, the shell temperature of the entire LEP system must be kept below 70°C to meet safety regulations.

III. Components and dimensions of LEP light source

3.1 LEP lamp head size (IP54)

3.2. Size of microwave solid-state source (IP65)

3.3. Driver power size (IP67)

A) Appearance size

B) Power supply parameters

3.4 Line configuration and overall dimension diagram

4、 Model Naming Rules and Selection Guidelines

remarks: 

1. Color temperature is a range value:

35 (3500K-4500K), 50 (5000K-5500K), 65 (6000K-6500K);

2. Explicit refers to the lowest range value

72 represents the lowest Ra72, 80 represents the lowest Ra80, 92 represents the lowest Ra92, 95 represents the lowest Ra95;

3. Customers can choose or customize light sources with different spectra based on their actual application needs for the same model of LEP light source. We welcome further communication with you, such as:

1) There will be many different spectral options (1-99) for LEP light sources of the same model. We will recommend spectral types that are more suitable for user scenarios based on customer needs;

2) Requirements for the proportion of various light colors such as red, green, blue, etc;

3) Specific color temperature and color rendering index range values;

4. Due to the continuous updating and development of technology, if there is any change in the above technical data, please refer to the quotation.