Comparison and Selection Guide for LED Fixtures with IP65, I...

I. Basic Meaning of IP Rating

• First digit (6): Dust protection level. Level 6 is the highest, indicating complete dust tightness—no dust can enter the fixture.
• Second digit (5/7/8): Water protection level. The higher the digit, the stronger the waterproof capability.

II. Detailed Comparison of IP65 vs IP67 vs IP68

III. Key Differences & Selection Points

1. IP65 (Basic Outdoor Waterproof)

• Limit: Can withstand rain and flushing, but must not be immersed in water [1][4].
• Scenarios: Outdoor areas that are exposed but not prone to water submersion (walls, overhead installations).

2. IP67 (Advanced Immersion Waterproof)

• Limit: Can be immersed in shallow water (≤1m) for 30 minutes, but not for long-term submersion [1][4].
• Scenarios: Areas prone to standing water or occasional submersion during heavy rain (ground, underground areas).

3. IP68 (Top-Tier Submersion Waterproof)

• Limit: Capable of long-term underwater operation at a specified depth (e.g., 2m for 24 hours) [1][4].
• Scenarios: Equipment that must be permanently submerged in water (swimming pools, fountains, fish tanks).

IV. Common Purchase Misconceptions

• IP67 ≠ Better than IP65 in all cases: IP67 excels at static immersion but may provide less protection against high-pressure dynamic water jets (e.g., water guns) compared to IP66 [1][9].
• No unified standard for IP68: Test depth and duration vary by manufacturer. Always confirm specific parameters before purchase [1][4][9].

V. Quick Selection Guide

1. Installed on Walls / Overhead (No Contact with Ground, No Submersion)

• Recommendation: IP65
• Examples: Outdoor wall lights, garden lights, street lights, wall washers, sign lights, storefront lights. Recommended products: LED wall light (15W-30W), LED garden light (20W-40W), LED sign light (10W-30W) [5][6]
• Environment: Only exposed to rain, splashes, and water jets; no standing water or submersion.
• Conclusion: IP65 is sufficient, providing reliable protection against rain and water jets for long-term use.

2. Installed on the Ground / Underground / Entrances (Prone to Standing Water, Occasional Submersion)

• Recommendation: IP67
• Examples: In-ground lights, walkway lights, garage entrance/exit lights, flower bed ground lights, garden ground lights. Recommended products: LED in-ground light (12V, 15W-25W), LED walkway light (8W-15W), LED garage light (40W-60W) [5][7]
• Environment: Prone to standing water and short-term submersion during heavy rain, but not permanent submersion.
• Conclusion: IP67 is mandatory, as it can withstand short-term immersion without water damage.

3. Installed Underwater / in Swimming Pools / Fountains (Permanent Submersion)

• Recommendation: IP68
• Examples: Swimming pool lights, fountain lights, underwater landscape lights, fish tank lights. Recommended products: LED pool light (24V, 30W-50W), LED fountain light (20W-40W), IP68 underwater LED strip (5050, 60 LEDs/m) [5][8]
• Environment: Permanently submerged in water, possibly at depths exceeding 1m.
• Conclusion: IP68 is mandatory, supporting continuous submersion for maximum safety.

Super Simple Quick Judgment

• Mounted on walls, no standing water → IP65
• Placed on the ground, prone to standing water → IP67
• Placed in water, permanently submerged → IP68

Sources 

• [1] International Electrotechnical Commission (IEC). IEC 60529: Degrees of protection provided by enclosures (IP code) [S]. 2013. https://www.iec.ch/ip-code
• [2] Underwriters Laboratories (UL). IP Rating Basics for Lighting [R]. 2022. https://www.ul.com/knowledge/ip-rating-basics
• [3] National Electrical Manufacturers Association (NEMA). IP Protection Ratings Overview [Z]. 2021. https://www.nema.org/ip-ratings-overview
• [4] British Standards Institution (BSI). Ingress Protection (IP) Ratings Explained [S]. 2013. https://www.bsigroup.com/en-GB/ip-ratings-explained/
• [5] Philips Lighting. Understanding IP Ratings for LED Lights [Z]. 2023. https://www.philips.com/c-m-li/lighting/understanding-ip-ratings
• [6] Cree Lighting. Outdoor LED Fixtures: Specifications & Solutions [Z]. 2023. https://www.cree.com/lighting/solutions/outdoor
• [7] Osram. Ground Lighting: Outdoor LED Products Guide [Z]. 2022. https://www.osram.com/osram-lighting/solutions/ground-lighting/
• [8] Mean Well. IP68 Underwater LED Solutions [Z]. 2023. https://www.meanwell.com/underwater-led-solutions
• [9] Lighting Research Center (LRC). IP Ratings for LED Fixtures: FAQ [R]. 2022. https://www.lrc.rpi.edu/ip-ratings-faq