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Frequently Asked Questions

Click on a questions below to view the answers

  1. How do photoluminescent products work?
  2. Do Safe Glow® products require electricity?
  3. Are Safe Glow products radioactive or toxic?
  4. Do Safe Glow products meet building codes?
  5. How can Safe Glow exit signs save my facility money?
  6. In what ways are Safe Glow products green?
  7. How difficult are Safe Glow exit signs to install?
  8. How do I ensure code compliance with lighting levels?
  9. How do I measure for light levels?
  10. What should I be concerned about in my efforts to maintain light levels?
  11. How should Safe Glow Exit Signs be Cleaned


1. How do photoluminescent products work?

Photoluminescent products work by absorbing ambient light (photons) and storing it like a battery. When lighting is removed, these products project light (release photons) immediately, producing a sustained glow that can last for more than 12 hours.

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2. Do Safe Glow products require electricity?

Building codes (UL 924) dictate that exit signs require 5-foot candles of fluorescent light in order to charge the products effectively. Based on UL 1994, low-level products require only 1 foot-candle in order to charge effectively. In most cases, the currently available light is all that is required.

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3. Are Safe Glow products radioactive or toxic?

All Safe Glow products are non-toxic, non-radioactive and contain no phosphorus or lead, or any other hazardous element or chemical.

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4. Do Safe Glow products meet building codes?

Yes! Safe Glow's exit signs are UL listed (35JP) to meet the specifications of UL 924, which is used to determine code compliance for National Fire Protection Life Safety 101 codes and the International Building Codes.

Safe Glow's low level products (Linear Path Markers and the stair step products) exceed the performance requirements stated on UL 1994 by a margin of approximately 20%.

Safe Glow products have not been tested for MEA compliance for New York City.

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5. How can Safe Glow exit signs save my facility money?

Click here to view our Cost Advantage Page. Briefly, Safe Glow exit signs eliminate the cost of electricity, there is no maintenance required, there are no replacement parts, and annual testing is minimized. These savings all combine to create a projected savings of at least $50 per sign, per year over energy efficient LED exit signs.

Those developing new facilities can save even more. Greener buildings can be achieved by placing light fixtures where they are needed to ensure the 5 foot candles of light is present where photoluminescent exit signs will be installed.

By choosing photoluminescent exit signs, developers can eliminate the infrastructure and cost associated with electric exit signs including:

Money saved during construction will pay for the photoluminescent signs before the building receives its certificate of occupancy. LEED points are available for the use of photoluminescent exit signs.

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6. In what ways are Safe Glow products green?

Click here to view our Sustainability page.

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7. How difficult are Safe Glow exit signs to install?

Installation is usually very simple and the tools required are pretty basic (cordless drill/screw driver, an 8/32 socket or adjustable wrench and a level). Most installations can be done in less than 15 minutes.

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8. How do I ensure code compliance with lighting levels?

Exit signs have specific UL 924 requirements for effective charging. They must have a minimum of 5 foot-candles of fluorescent light on the face of the sign at all times of building occupancy. Annual checks with a reliable light meter, capable of measuring in foot-candles is required by building code to ensure that sufficient lighting is available for effective operation.

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9. How do I measure for light levels?

When installing your Safe Glow products, it is important to measure ambient light where your products are to be installed, and test the products for effective performance. These measurements can then be referred to in the future to ensure that light levels are the same as when installed. A light meter that measures in foot-candles should be used to establish these benchmarks. Safe Glow offers a digital light meter with the ability to measure light levels and record them internally. This is helpful when doing annual testing on a large number of exit signs. Annual testing can be done almost as fast as an engineer can walk your facility. The test results can be downloaded to an Excel spreadsheet and archived off site as insurance to show annual testing was performed and the results of that testing.

If external light affects the light levels in your facility, we recommend doing your light testing at night when the only light present is provided by light fixtures. This way, you can be assured that the light present on the face of your signs will never fall below that required by building code.

When testing the light on your sign, hold the sensor very near the face of your sign and point the sensor towards the closest light source. This will give you an accurate reading of the light being projected onto the face of your exit sign.

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10. What should I be concerned about in my efforts to maintain light levels?

The biggest concern about available light for effective charging is keeping light fixture diffusers clean and keeping burned out bulbs replaced. A monthly visual inspection for burned out bulbs and dirt is recommended.

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11. How should Safe Glow exit signs be cleaned

If there is a visible amount of dust is on the face of the sign, it should be either dusted off or cleaned. Always use a mild cleaner with a slightly damp micro-fiber towel, which will minimize scratching on the surface of the sign. Failure to follow these instructions may impair the performance of your Safe Glow signs.

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