Many first-time clients and even those brand-new to the world of commercial lighting– understand they want to upgrade to LED. The innovation has ended up being so effective, cost-efficient, flexible, and simple to keep, it’s going beyond conventional lighting technologies much faster than we ever could have expected.
However what if you already have HPS fixtures installed? How hard is it to make the switch? You might be amazed to discover that the shift isn’t as basic as making a watt-for-watt switch. Because of the distinctions in HPS and LED technologies, you’ll have to make a series of estimations if you wish to discover an equivalent LED wall pack to replace your HPS fixture.
Like a lot of consumers trying to find an LED choice, she wanted to benefit from the remarkable performance of LED technology to save energy and decrease the requirement for maintenance. She likewise desired her brand-new wall loads to give off a familiar, warm light.
Utilizing her demand as an example, we’ll walk you through How To Build A Led Light lighting professionals discovered her simply the ideal LED wall pack replacements to update her out-of-date HPS luminaires.
1.) Verify the Wattage of the High Pressure Sodium Lamp in Your Existing Wall Pack
Given that LEDs are a lot more efficient than HPS systems, wattage isn’t a basic one-for-one tradeoff. Nevertheless, knowing the wattage of your current fixture is the primary step to identifying which LED wall pack will offer the lighting you want.
Your existing lighting fixture will display its wattage information: on a tag inside the luminaire, on the ballast, or on the light itself. Once you have the HPS light wattage, you can move to the next action. We validated with the client that she was utilizing a 250w HPS wall pack.
2.) Discover the Mean Lamp Lumens of Your High Pressure Sodium Lamp
Mean light lumens is a lamp’s typical lumen output throughout its life. High pressure salt (HPS) lamps begin their operating life with a high lumen output that degrades over time, a phenomenon described as lumen devaluation. Mean light lumens represent lumen devaluation with factor to consider to the amount of lumens given off by the light after 50% of its ranked life. Numerous makers will have this information available if you contact them with the HPS fixture model number. For your convenience, we have actually developed the following table, “High Pressure Sodium (HPS) Mean Lumens and System Watts,” that lists the mean lumens for popular HPS light wattages (the table also consists of other information that we will utilize in later steps).
3.) Adjust Mean Lumen Output for Visible Lumens (Scotopic vs. Photopic Lumens).
Visual understanding has two elements: photopic and scotopic vision. Photopic vision refers to sight in high light levels and is controlled primarily by our cones. Scotopic vision describes sight in lower light levels and is controlled primarily by our rods. Current studies reveal that most of our visual perception is the outcome of a combined effort in between the rods and cones. This visual range is called the mesopic region.
The ratio in between a light’s scotopic luminance and its photopic luminance is called its S/P ratio. A higher S/P ratio will offer sharper vision and much better color rendering. To find the actual exposure offered by a component, you require to figure out the S/P ratio and multiply it by the mean lumens of the luminaire.
When identifying the S/P ratio, it is time to identify the visually reliable lumens (VELs), likewise called student lumens or functional lumens. A fast and effective way to approximate VELs for HPS fixtures is to multiply the mean light lumens by the S/P ratio. In the example of the 250w HPS, we would utilize the list below equation:.
27,000 x 0.62 = 16,740 VELs.
4.) Determine the Luminaire Efficacy of Your HPS Wall Pack.
To calculate an HPS luminaire’s efficacy, divide its released lumens by its lamp lumens.
Luminaire Efficacy = Emitted Lumens/ Lamp Lumens.
The producer of your HPS wall pack will have the figures for both emitted lumens and light lumens. If you want to save yourself a call, you can utilize the following cheat sheet, “Approximate Luminaire Efficacy of HPS and LED Wall Packs,” to get straight to your response. It is essential to note that the housing design of a component will impact its efficacy; a traditional wall pack will have greater effectiveness than its full cutoff equivalent.
5.) Determining Mean Visible Luminaire Lumens of Your HPS Wall Pack.
Mean visible luminaire lumens is the typical variety of lumens put out by a wall pack over its lifetime. This calculation is relatively basic. Increase the VELs we found in step 3 by the overall luminaire efficacy we found in step 4.
If you beloved this article and you would like to obtain far more details regarding Https://Sites.Google.Com/Site/Ledshoplightsnh/Latest-Led-Shop-Lights-Pdf/Plug-In-Led-Shop-Lights-Pdf kindly check out our web-site. For the consumer with a 250w HPS wall pack, the formula would look like this:.
16,740 x 65% = 10,881 mean visible luminaire lumens.
6.) Calculating Mean Visible Luminaire Lumens for LED.
As soon as you know the mean visible luminaire lumens for the HPS wall pack, you have to discover this exact same figure for LEDs and compare the two. Easy enough, right?
Well, not quite. Due to the differences in between HPS and LED technology, the calculations for LEDs are somewhat various. If you’re unsure which LED component to utilize, an excellent starting point is to halve the HPS wattage as the perfect LED wattage. For instance: the client had a 250w HPS wall pack; half of that is 125w. The closest LED wall pack would be a 126w LED wall pack, so we utilized that fixture as our beginning point. Remember, though, that this method only offers an informed guess; after running the following estimations, you’ll likely want to check out various LED wattages to find a better match for your requirements. Take the following actions to discover the mean noticeable luminaire lumens for the LED wall pack.
1.) Identify the preliminary light source lumens. Many manufacturers will have data on initial source of light lumens on record.
The 126w LED light tosses 17,724 preliminary source of light lumens.
2.) Increase the preliminary light source lumens by 85% to get the mean light lumens. Bear in mind that LED fixtures in some cases utilize LED chips instead of lamps; for the sake of this workout, we’re using “suggest lamp lumens” to refer to both styles. Also remember our earlier discussion on lumen devaluation; LEDs diminish far less dramatically than HPS– so much so that an LED component at 85% of its rated life will perform as well as an HPS fixture at 50% of its ranked life.
17,724 x 85% = 15,065.4 mean lamp lumens.
3.) Utilize the S/P ratio chart to choose the S/P ratio for the LED wall pack.
The S/P ratio for a 3000K LED is 1.21, or 121%.
4.) Multiply suggest light lumens by the S/P ratio to find the VELs of the LED fixture.
15,065.4 x 121% = 18,229.13 VELs.
5.) Use the “Luminaire Efficacy of HPS and LED Wall Packs” table to identify the efficacy of the LED fixture.
The effectiveness of a standard LED wall pack is 83%.
6.) Find the mean noticeable luminaire lumens by multiplying the VELs by the efficacy of the wall pack.
18,229.13 x 83% = 15,130.18 mean visible luminaire lumens.
At this moment, you understand the mean noticeable luminaire lumens for both HPS and LED. If we look back to step 6, we can note that the figure for the mean noticeable luminaire lumens of our customer’s 250w HPS wall pack was 10,881. The figure for the mean visible luminaire lumens of the 126w traditional wall pack is 15,130.
7.) Effectively Choosing the Right Luminaire for You.
If we compare the two mean visible luminaire lumens of the two wall packs, we can see that the 126w LED we utilized in step 6 would provide much more light than would be needed. Once recognizing this, we ran the numbers for lower LED wattages till we discovered one that offered similar mean visible luminaire lumens to the client’s HPS wall pack.
We discovered that our 63w traditional wall pack threw 7,565 mean visible luminaire lumens. At this moment, we understood we were close. We ran the estimations for a 95w wall pack to see if it would be a much better suitable for this client, and it was!
Our client desired her new LED wall pack to provide comparable light strength and color to her old HPS wall pack and this one seemed like the right one for the job. We presented the 95w High Output LED Large Traditional Wall Pack 120v-277v as her perfect replacement. It throws about 11,348 mean visible luminaire lumens– right in the exact same ballpark as her 250w HPS. She mored than happy with our service, and the new LED wall packs were set up less than 2 weeks later.
The brand-new fixtures discharge comparable light; save a huge amount of electrical power; improve visibility; decrease the requirement for upkeep; and release the warm, 3000K glow she wanted. They will provide our consumer up to 100,000 hours of energy-efficient illumination.
We do not anticipate you wade through all these calculations on your own– that’s why we’re here! Merely enough, we like this stuff and look forward to assisting you browse the transition from HPS to LED.