What is the Color Rendering Index (CRI) for LED floodlights?
Luminous efficacy (also known as luminous flux) refers to the luminous flux (lumens) emitted per watt of electrical power consumed, measured in lm/W. This is one of the most crucial technical indicators for measuring the energy efficiency of LED floodlights. Currently, the luminous efficacy range of mainstream LED floodlights on the market is roughly between 80 and 160 lm/W. Specifically, they can be divided into three tiers:
Entry-level (80-100 lm/W): These products typically use low-end domestic LED chips, have lower driving efficiency, and generally poor heat dissipation design. They are inexpensive and suitable for situations where electricity costs are not a major concern or usage time is very short (such as occasional temporary lighting).
Mainstream-level (100-130 lm/W): The vast majority of reputable brand LED floodlights fall into this range. They use well-known brand LED chips (such as Epistar, Sanan, CREE, OSRAM, Lumileds, etc.) and high-efficiency drivers (typical efficiency ≥90%). For locations where daily use exceeds 4 hours, choosing mainstream-level products offers excellent economic benefits. High-end (130-160 lm/W or even higher): These products typically utilize the latest flip-chip technology, COB packaging, ultra-efficient driver power supplies, and optimized optical designs. A 150 lm/W product saves 20% more energy than a 120 lm/W product at the same brightness. For example, to achieve 12.000 lumens, 100 lm/W requires 120W, while 150 lm/W only requires 80W. Although high-end products are more expensive, they offer a shorter payback period for large-scale projects or in areas with high electricity prices. It's important to note that manufacturers sometimes misrepresent luminous efficacy, especially in low-priced products sold online. Consumers should request to see third-party test reports (LM-79 or GB/T 9468) or perform actual measurements using an integrating sphere.
Furthermore, the overall luminous efficacy of a lamp is not the same as the luminous efficacy of individual LEDs, as factors such as drive losses, lens transmittance (typically 92%-95%), and heat loss can cause the overall luminous efficacy to be 5%-15% lower than that of individual LEDs. Therefore, the overall luminous efficacy of the same LED chip can vary greatly depending on the design of the lighting fixture. Please refer to the overall luminous efficacy when purchasing.
