Tag Archives: Photoluminescent Exit Signs

Battle of the Power Free Exit Signs: Tritium vs. Photoluminescent

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Which Power-Free Exit Sign is Right for You?

Picture the scene… a centuries old brick building receives the designation as a protected historical site. The owners want to open a museum on the premises and begin the daunting task of bringing it up to code for public use. The fire marshal says all that’s left is the matter of egress lighting…

What to do? An exit sign is required to be mounted on that beautiful brick wall but there is no electricity at that location.

Many find themselves in this predicament, whether it’s a historical site or not. Do you really want to shell out upwards of $1000 to have an electrician run power to a location that doesn’t have it? There must be a better way right?

Enter the Power-Free Exit Sign options

Tritium Exit Signs

In the blue corner we have the self-luminous tritium exit sign. These signs are lit by tritium gas, which is contained within hermetically sealed, phosphor-lined glass tubes. Electrons emitted by the gas bombard the phosphor causing it to produce illumination. This all happens without the need for any outside power or intervention. It’s the same technology used in watch hands and firearm optics. Click here to see our full line of tritium exit signs.

Tritium Pros:

  • Set and forget – truly self-contained and maintenance free
  • Easy installation – no electrician needed
  • Code compliant – meets UL924 and NFPA 101 life safety standards

Tritium Cons:

  • High cost – starting in the upper $200’s, there is a high entry cost
  • Disposal – the costs don’t stop at the purchase price. Once the lifespan has expired, there is a high cost for disposal as well
  • Paperwork – due to their nature, these need to be registered with the US Nuclear Regulatory Commission

Photoluminescent Exit Signs

In the red corner we have the photoluminescent exit sign. Made with photoluminescent pigments, these signs can absorb and store energy from ambient light. In the case of sudden darkness, such as a power outage, the photoluminescent material is immediately visible. Think ‘glow-in-the-dark’ toys from childhood, only much better quality. Click here to see our full line of UL listed photoluminescent exit signs.

Photoluminescent Pros:

  • Set and forget – maintenance free. No need for batteries, bulbs or even testing
  • Easy installation – no electrician needed
  • Code compliant – meets UL924 and NFPA 101 life safety standards
  • Low cost – UL Listed exit signs starting in the $40 range, so these offer the most value when installation costs are factored in

Photoluminescent Cons:

  • Light charging – 54 lux light requirement at installation location needed to maintain the “charge” of the photoluminescent pigment (light can be from manmade or natural sources), so these are not suitable for dark locations

And the Winner is…

In our opinion, the low cost and ease of installation make photoluminescent exit signs the clear winner. The one caveat is the light requirement needed to keep the photoluminescent material functioning correctly. There is a place for tritium where this light is not available, but the high initial cost as well as price of disposal make it a harder pill to swallow. If you have any questions, please contact our award winning customer service team at 877-352-3948.

Power Free, Photoluminescent “glow-in-the-dark” Exit Signs

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Image of UL 924 listed photoluminescent exit signPhotoluminescent signs, often referred to as “glow-in-the-dark” signs, absorb and store energy from normal ambient light, then release this energy in the form of a visible glow when the lights go out. Photoluminescent products automatically recharge once the lights are turned on, requiring approximately 60 minutes of exposure to 5 foot-candles or 54 LUX of natural light‡, fluorescent, metal halide or mercury vapor light. [ ‡A 100W incandescent bulb produces about 1750 lumens or 137 foot-candles. A 23 watt fluorescent light produces about 1600 lumens or 125 foot-candles. ]

In the event of a power failure UL 924 listed photoluminescent exit signs are immediately visible from a distance of 50 to 75 feet. Current photoluminescent materials have a much longer and brighter glow compared to old materials, helping to speed evacuation during a lights-out emergency.

This failsafe technology works without electricity. Photoluminescent exit signs are completely power free, requiring no electricity (AC) or batter power to operate. Since no electrical connection is required, installation is very easy. Plus, with no power consumption, no electronics, no batteries to replace and no bulbs to burn out or break, these signs provide zero operational or maintenance costs over the lifetime of the product. Industrial-grade photoluminescent tapes and signs are designed to withstand normal wear and tear, making them a reliable solution that is “always ready” in an emergency.

A Proven Solution

Shortly after the tragic events of September 11th, the National Institute of Standards and Technology conducted an investigation into the evacuation process at the World Trade Center. According to the investigation, existing photoluminescent markings in the stairwells was one of the most commonly reported forms of aid in evacuating the buildings. As a result, the city of New York passed Local Law 26, requiring the installation of photoluminescent exit signs and floor level exit pathway markings in all commercial high rise buildings over 75 feet tall. Residential, hospital, hotel and educational buildings are installing photoluminescent exit signs and egress markings on a voluntary basis.

We recommend photoluminescent fixtures and markings as a reliable, energy efficient and cost effective solution to prepare for a lights-out emergency in your facility.