1. Document Overview
This technical document provides comprehensive information regarding the lifecycle phase of a specific component or system. The primary data presented indicates a consistent state of Revision 7, with a release date of July 14, 2014, and an expiration period designated as \"Forever.\" This suggests the document pertains to a finalized, stable revision intended for long-term reference without planned obsolescence. The repeated entries signify the uniformity of this status across multiple instances or entries within the document's scope, likely representing a batch or a standard specification.
The core purpose of such documentation is to establish a definitive reference point for engineers, procurement specialists, and quality assurance teams. It ensures all stakeholders are aligned on the exact revision of the product or specification in use, which is critical for consistency in manufacturing, testing, and application design. The \"Forever\" expiration underscores the permanence of this revision for archival and legacy support purposes.
2. Technical Parameters and Data Interpretation
The provided data points are minimal but highly significant in a technical context. Each entry consists of three key fields: LifecyclePhase, Expired Period, and Release Date.
2.1 Lifecycle Phase: Revision
The value \"Revision: 7\" explicitly identifies the maturity and versioning of the documented item. In product lifecycle management, a revision number tracks iterative changes, improvements, or corrections made to the initial design or specification. Revision 7 indicates this is the seventh official iteration. This number is crucial for traceability, allowing any issue or inquiry to be pinpointed to a specific version of the product's design or documentation.
2.2 Expired Period: Forever
The \"Forever\" designation for the expiration period is a critical parameter. It signifies that this revision does not have a planned end-of-life (EOL) date. In practical terms, this means the specification is considered final and will remain valid indefinitely for reference. It does not imply the product is perpetually in production, but rather that the technical data for Revision 7 is permanently archived and valid for any future analysis, repair, or compatibility checking of units produced under this revision.
2.3 Release Date: 2014-07-14
The release date timestamp (\"2014-07-14 14:20:00.0\") provides the exact moment this revision was formally issued and became active. This is essential for establishing timelines, understanding the product's history, and for compliance with regulations that may require knowledge of when a particular specification was in effect. The precision down to seconds is typical in configuration management systems.
3. Grading and Versioning System
The document implicitly demonstrates a strict version control system. The sole focus on \"Revision 7\" suggests a linear, sequential revision history. There is no indication of sub-revisions or different branches (e.g., 7.1, 7A), implying a controlled and centralized change management process where each change increments the main revision number.
4. Performance and Longevity Analysis
The combination of \"Revision 7\" and \"Expired Period: Forever\" allows for an analysis of the product's intended performance lifecycle. A high revision number (7) often correlates with a mature, well-tested product where major design flaws have been addressed through previous iterations. The \"Forever\" status then locks in this mature state, indicating high confidence in its long-term reliability and stability. This is common for components used in infrastructure, industrial equipment, or other applications requiring decades of service life and predictable performance.
5. Mechanical and Documentation Specifications
While specific mechanical dimensions are not provided in the excerpt, the document structure itself is a specification. The repetitive, tabular format is designed for machine readability and integration into Product Lifecycle Management (PLM) or Enterprise Resource Planning (ERP) systems. Each line can be parsed as a discrete data record, ensuring automated systems can correctly identify the revision status of associated parts.
6. Handling and Compliance Guidelines
For users of this document, the key guideline is to ensure that any reference to the product or system aligns explicitly with \"Revision 7.\" In design, manufacturing, and procurement, this revision number must be specified to guarantee consistency. The \"Forever\" expiration simplifies logistics as there is no need to track an EOL date for this document version, but it places the responsibility on the user to maintain this archival record.
7. Packaging and Ordering Information
The document's format suggests it may be part of a larger data packet or label system. When ordering components governed by this document, the revision number (7) is the critical identifier that must be included in the part number or order notes to receive the correct version. The release date can also serve as a secondary check to verify the authenticity of the documentation provided with shipped goods.
8. Application Recommendations
This type of documentation is fundamental in applications where audit trails, long-term maintenance, and regulatory compliance are paramount. Industries such as aerospace, medical devices, automotive, and industrial automation rely heavily on precise revision control. Knowing that a system uses \"Revision 7, released on 2014-07-14\" allows for accurate service manuals, correct spare parts, and validated safety analyses to be applied throughout the product's operational life.
9. Technical Comparison and Context
Compared to a document showing an active revision with a finite expiration date, this \"Forever\" revision indicates a different lifecycle strategy. An active revision might be superseded by a newer version, rendering the old one obsolete. This document, however, represents a \"frozen\" or \"baselined\" state. Its advantage is providing an immutable reference, eliminating confusion that can arise from living documents that change. The trade-off is that it does not reflect any potential improvements or corrections made after July 2014.
10. Frequently Asked Questions (FAQ)
10.1 What does \"Expired Period: Forever\" mean for sourcing parts?
It means the technical specification for Revision 7 will never be invalidated. However, it does not guarantee the physical components are perpetually available for purchase. Component availability depends on the manufacturer's production decisions. This document ensures that if you have parts labeled Revision 7, you have the correct permanent reference for their specifications.
10.2 Can we use a later revision if Revision 7 is specified?
Not without formal review and qualification. A later revision (e.g., Revision 8) may have intentional changes that affect form, fit, or function. Substituting it for Revision 7 could introduce compatibility issues or require design modifications. Always adhere to the specified revision unless a formal engineering change order approves an alternative.
10.3 How should this document be stored and referenced?
It should be stored as a controlled document within a quality management system, ideally with version control to prevent accidental alteration. Its reference (Doc ID, Revision 7, Release Date) should be explicitly called out in all related design files, bill of materials (BOM), and manufacturing instructions.
11. Practical Use Case Scenarios
Scenario 1: Legacy System Repair. A technician servicing a piece of industrial equipment manufactured in 2015 needs to replace a failed module. The service manual specifies the module must be \"Revision 7 or compatible.\" By referring to this document, the technician can verify the authentic technical specs of a potential replacement part to ensure compatibility, even if the original manufacturer no longer supports the product.
Scenario 2: Regulatory Audit. During an audit for a medical device, regulators request proof of the specifications for a critical component used in a device shipped in 2016. The manufacturer provides this document (Revision 7, Release Date 2014-07-14) as the definitive specification that was in effect at the time of production, satisfying the audit requirement for documented design controls.
12. Underlying Principles
This document embodies the principle of \"configuration identification\" within configuration management. Its purpose is to uniquely identify a specific version of a product's technical data to prevent ambiguity. The principles of traceability (via revision number), accountability (via release date), and permanence (via forever expiration) are all applied to create a reliable foundation for complex engineering and supply chain activities.
13. Industry Trends and Evolution
The trend in technical documentation is moving towards fully digital, linked data within smart PDFs or web-based systems. While this excerpt shows a simple text format, modern equivalents might embed machine-readable QR codes or digital signatures that link to a blockchain or a cloud-based PLM system for instant verification of authenticity and revision history. The core need for immutable revision baselines, as shown here, remains constant, but the methods for distribution, verification, and integration are becoming more sophisticated and secure.
LED Specification Terminology
Complete explanation of LED technical terms
Photoelectric Performance
| Term | Unit/Representation | Simple Explanation | Why Important |
|---|---|---|---|
| Luminous Efficacy | lm/W (lumens per watt) | Light output per watt of electricity, higher means more energy efficient. | Directly determines energy efficiency grade and electricity cost. |
| Luminous Flux | lm (lumens) | Total light emitted by source, commonly called "brightness". | Determines if the light is bright enough. |
| Viewing Angle | ° (degrees), e.g., 120° | Angle where light intensity drops to half, determines beam width. | Affects illumination range and uniformity. |
| CCT (Color Temperature) | K (Kelvin), e.g., 2700K/6500K | Warmth/coolness of light, lower values yellowish/warm, higher whitish/cool. | Determines lighting atmosphere and suitable scenarios. |
| CRI / Ra | Unitless, 0–100 | Ability to render object colors accurately, Ra≥80 is good. | Affects color authenticity, used in high-demand places like malls, museums. |
| SDCM | MacAdam ellipse steps, e.g., "5-step" | Color consistency metric, smaller steps mean more consistent color. | Ensures uniform color across same batch of LEDs. |
| Dominant Wavelength | nm (nanometers), e.g., 620nm (red) | Wavelength corresponding to color of colored LEDs. | Determines hue of red, yellow, green monochrome LEDs. |
| Spectral Distribution | Wavelength vs intensity curve | Shows intensity distribution across wavelengths. | Affects color rendering and quality. |
Electrical Parameters
| Term | Symbol | Simple Explanation | Design Considerations |
|---|---|---|---|
| Forward Voltage | Vf | Minimum voltage to turn on LED, like "starting threshold". | Driver voltage must be ≥Vf, voltages add up for series LEDs. |
| Forward Current | If | Current value for normal LED operation. | Usually constant current drive, current determines brightness & lifespan. |
| Max Pulse Current | Ifp | Peak current tolerable for short periods, used for dimming or flashing. | Pulse width & duty cycle must be strictly controlled to avoid damage. |
| Reverse Voltage | Vr | Max reverse voltage LED can withstand, beyond may cause breakdown. | Circuit must prevent reverse connection or voltage spikes. |
| Thermal Resistance | Rth (°C/W) | Resistance to heat transfer from chip to solder, lower is better. | High thermal resistance requires stronger heat dissipation. |
| ESD Immunity | V (HBM), e.g., 1000V | Ability to withstand electrostatic discharge, higher means less vulnerable. | Anti-static measures needed in production, especially for sensitive LEDs. |
Thermal Management & Reliability
| Term | Key Metric | Simple Explanation | Impact |
|---|---|---|---|
| Junction Temperature | Tj (°C) | Actual operating temperature inside LED chip. | Every 10°C reduction may double lifespan; too high causes light decay, color shift. |
| Lumen Depreciation | L70 / L80 (hours) | Time for brightness to drop to 70% or 80% of initial. | Directly defines LED "service life". |
| Lumen Maintenance | % (e.g., 70%) | Percentage of brightness retained after time. | Indicates brightness retention over long-term use. |
| Color Shift | Δu′v′ or MacAdam ellipse | Degree of color change during use. | Affects color consistency in lighting scenes. |
| Thermal Aging | Material degradation | Deterioration due to long-term high temperature. | May cause brightness drop, color change, or open-circuit failure. |
Packaging & Materials
| Term | Common Types | Simple Explanation | Features & Applications |
|---|---|---|---|
| Package Type | EMC, PPA, Ceramic | Housing material protecting chip, providing optical/thermal interface. | EMC: good heat resistance, low cost; Ceramic: better heat dissipation, longer life. |
| Chip Structure | Front, Flip Chip | Chip electrode arrangement. | Flip chip: better heat dissipation, higher efficacy, for high-power. |
| Phosphor Coating | YAG, Silicate, Nitride | Covers blue chip, converts some to yellow/red, mixes to white. | Different phosphors affect efficacy, CCT, and CRI. |
| Lens/Optics | Flat, Microlens, TIR | Optical structure on surface controlling light distribution. | Determines viewing angle and light distribution curve. |
Quality Control & Binning
| Term | Binning Content | Simple Explanation | Purpose |
|---|---|---|---|
| Luminous Flux Bin | Code e.g., 2G, 2H | Grouped by brightness, each group has min/max lumen values. | Ensures uniform brightness in same batch. |
| Voltage Bin | Code e.g., 6W, 6X | Grouped by forward voltage range. | Facilitates driver matching, improves system efficiency. |
| Color Bin | 5-step MacAdam ellipse | Grouped by color coordinates, ensuring tight range. | Guarantees color consistency, avoids uneven color within fixture. |
| CCT Bin | 2700K, 3000K etc. | Grouped by CCT, each has corresponding coordinate range. | Meets different scene CCT requirements. |
Testing & Certification
| Term | Standard/Test | Simple Explanation | Significance |
|---|---|---|---|
| LM-80 | Lumen maintenance test | Long-term lighting at constant temperature, recording brightness decay. | Used to estimate LED life (with TM-21). |
| TM-21 | Life estimation standard | Estimates life under actual conditions based on LM-80 data. | Provides scientific life prediction. |
| IESNA | Illuminating Engineering Society | Covers optical, electrical, thermal test methods. | Industry-recognized test basis. |
| RoHS / REACH | Environmental certification | Ensures no harmful substances (lead, mercury). | Market access requirement internationally. |
| ENERGY STAR / DLC | Energy efficiency certification | Energy efficiency and performance certification for lighting. | Used in government procurement, subsidy programs, enhances competitiveness. |