A lot of time we are asked what is the equivalent LED product to convert from Metal Halide, High Pressure Sodium or Mercury Vapor. And a lot of time, we have a product in mind that works based on past experience. But how did we come up with that product, and how did we make the original decision on what was the proper replacement?

There’s a lot of science that goes into light, color, quality, and each light had it’s own characteristics. For example, it takes less LED to replace High Pressure Sodium than it takes to replace Metal Halide. And we are talking a lot more than just lumens. We are talking about color temperature, quality of light and something called photopic / scotopic lumens.

In the world of lighting, we measure foot candles with a light meter, this is called a photopic measurement. The light meter picks up everything, including spectrum’s that are invisible to us. Now, we humans see things to, and this is called scotopic lumens. Our rods and cones read and interpret light. And it does so differently than what a light meter does. So it is not uncommon when we demo a LED Light against a HPS light or Metal Halide, we first ask “Which is brighter” before we show the light meter reading. It leaves a few people scratching their heads. Well, that’s the science of of it all, and fortunately there is some handy tables called SP ratios that allow us to take the lumens of a particular light (photopic lumens) and multiply it by the S/P ratio to get the scotopic lumens equivalent.

For example, the S/P ratio for High Pressure Sodium is 0.40. The S/P ratio for LED at 5000K is 1.8. So if you take 40,000 lumens of HPS and multiply it 0.4, the effective scotopic lumens is 16,000. To get the same amount of lumens from LED, take the 16,000 and divide it by the S/P ratio and you get 8888 lumens. So the 8888 lumens of LED is the photopic measurement, the 16,000 LED lumens is the scotopic lumens measurement. So in an nutshell, you need 8,888 lumens of LED to replace 40,000 lumens of HPS from a scotopic point of view.

Here is a handy chart of common lights and ratios for you to use.

We’re finally through another summer in Texas. Our air conditioners are being turned off for the first time in months, and we’re all looking forward to watching that power bill drop. Now that your electrical system is under less stress, it’s the perfect time to make sure that the system is working the way it should.

Nobody should go years without performing maintenance on their vehicle. It just makes no sense to throw away the investment you made on a vehicle. And yet, people regularly go years and years without having their electrical system inspected on their home. Typically you spend a lot more on your home than a vehicle, yet both can be dangerous if you don’t do regular maintenance!

With this in mind, I wanted to share some important Electrical System Maintenance with you that can help keep you safe and even keep your power bill low! Keep in mind that the things I’m going to share with you aren’t really things you can do on your own; you should always contact a Licensed Dallas Electrician to implement any of these tips.

With that in mind:

Thunderstorms pose a safety hazard in several ways. Lightning is the most dangerous part of a thunderstorm, and it kills more people than hurricanes and tornadoes combined. Thunderstorms produce heavy rain, which can cause flash flooding. The strong winds from a thunderstorm can also cause widespread damage. Each of these components requires specific precautions to minimize their danger.

A thunderstorm typically has a diameter of 15 miles and lasts for 30 minutes, which is much smaller than a hurricane or winter storm. The National Weather Service places specific criteria on a severe thunderstorm. These include thunderstorms that produce hail with a diameter of at least ¾ inch, wind gusts of at least 58 mph or a tornado. Severe thunderstorms comprise about 10 percent of all thunderstorms.

The NWS recommends that you stay indoors for 30 minutes after the last clap of thunder when you hear thunder less than 30 seconds after the lightning. This rule is known as the 30/30 lightning safety rule.

Avoid taking emergency shelter in structures that are vulnerable to high winds, such as a mobile home. Outdoors shelters such as sheds, pavilions and golf’s typically will not protect you from flying debris and lightning. Avoid and report downed power lines. Bring pets and livestock under shelter to protect them during hailstorms.

Part of my job as an electrician is not only to help fix an electrical system when something goes wrong, but also to help my customers make sure that the fixtures are correctly installed. Installation is the most important phase for an electrical fixture or appliance; following the proper procedures can help ensure the maximum life for the electrical device, minimize its upkeep, and save you from costly repairs.

One of the most popular fixtures I am called to install are chandeliers, and with good reason.  As beautiful and elegant as they can be, home chandelier installation can be extremely tricky, even for those with experience.  If you have recently purchased a chandelier, I strongly encourage you to call a skilled Richardson electrician to have it installed; a talented electrician knows how to best hang, wire, and secure your chandelier to the ceiling. With that in mind, here are some important electrical safety tips to ensure you get the most out of your new light fixture: