Photoluminescent Products & LED Lighting

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Photoluminescent Products & LED Lighting

Post by Admin on Mon Mar 20, 2017 2:02 pm

The answer to the question, "Does our tape work with LED lighting?" is not as simple as one might expect.
I will provide some short answers and a longer explanation that I hope will help to give the customer a deeper understanding.
If after sharing this information, the customer has additional questions, I would prefer to speak with them directly.

Short Answers -
Does our tape work with LED lighting?
• The short answer: Yes. It does. Brady photo-luminescent tape will glow after exposure to LED lighting.
If not, is it only florescent lighting that works best with the tape?
• The short answer:
o There can be differences in performance under different light sources. In most cases, those differences would be imperceptible to a person, as long as minimum levels of lighting intensity (as measured in foot-candles or lux) are maintained.
o Customers might perceive a difference if making intentional head-to-head comparisons of performance under different types of lighting. For example, if exposing the same product to two different light sources, a person might be able to see different levels of photo-luminescence upon turning off the lights.
o Brady has no performance testing data to share about this. We have not measured these differences and we are unable to advise regarding optimum choice of light source.
o Brady products do meet the industry and performance standards claimed on our Technical Data Sheets for photo-luminescent materials.
o Ultimately, the end-user must decide whether the performance standards claimed by Brady are suitable to the application.

Longer Questions / Answers
How should a customer approach decision-making about choices of lighting in combination with photo-luminescent materials?
• First, determine the applicable standards for the application. International Building Code (IBC) is a great place to start. Other local or municipal standards (such as New York City - NYC) might also apply. These standards should address the requirements for both lighting and photo-luminescent marking.
• If the standard requirements for both lighting and photo-luminescent marking are understood and met by the customer's facility design, then the combination of lighting and photo-luminescent marking are acceptable under those same standards.

• NOTE: To Brady's knowledge, the lighting standards typically specify minimum levels of luminance (foot-candle or lux values) but do not specify particular lighting technology such as incandescent, fluorescent, etc. However, it is the customer's responsibility to research and understand the standards applicable to each facility.

From a high-level perspective, photo-luminescent performance specifications for Brady products are controlled as follows:
1) Photo-luminescent performance standards are set by industry organizations (such as ASTM, IBC, etc.) or sometimes by government authorities. These authorities define the performance requirements and the test methods used to measure performance.
2) Brady researches and chooses appropriate standards for product testing and performance targets, according to our target markets. These standards drive the testing that we do to characterize and qualify our product designs to meet standards and regulations such as IBC or NYC.
• The majority of Brady photo-luminescent products are tested according to ASTM E2072-14 and ASTM E2073-10 standards.
• These ASTM methods require the use of a specific light source (which happens not to be LED) to determine photo-luminescent performance.
• Typical photo-luminescent performance levels for Brady products are published on the Technical Data Sheets (TDS) for each B-number material.
• Technical Data Sheets (TDS) for all Brady products are accessible on bradyid.com. Just search for the B-number of interest. For example, our photo-luminescent product offering includes B-324, B-523, B-981 and other B-numbers.
• The data sheets are useful to help the customer understand and compare the expected performance for different material alternatives, as measured under the same standard light source.
3) Variability due to alternative light sources is not addressed by Brady's design process because it is not addressed by the standard authorities.
• It is true that various light sources (incandescent, fluorescent, LED, etc.) emit different light spectra and intensity which might possibly contribute to some variability in photo-luminescent performance.
Although the world has clearly increased its use of LED lighting, Brady is not aware of any industry standard that specifies LED light sources to be used in testing.

Brady has not invested in testing under LED lighting because the standard-controlling authorities have not defined or required LED exposure parameters to be used in a standard test. That is why Brady does not publish or claim specific levels of photo-luminescent performance under LED lighting.
The situation for LED lighting is not different vs. any other light source (fluorescent or incandescent). Our product performance is characterized by the test result using the ASTM-specified standard light source, but no other sources are measured.

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