the blur
Senior Member
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- cyberspace
how do the LED wall packs compare to the 400w HPS wall packs?
LED wall pack
- Thread starter the blur
- Start date
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- Licensed Electrician
In what way?
The light is blue instead of yellow and it hardly reaches the ground.
LED manufactures claim their lights will last until the Mayan Calender cycles through again. I don't figure on being around then, and I figure they think most who buy them will not be either so they can claim an outrageous service life.
The light is blue instead of yellow and it hardly reaches the ground.
LED manufactures claim their lights will last until the Mayan Calender cycles through again. I don't figure on being around then, and I figure they think most who buy them will not be either so they can claim an outrageous service life.
ptonsparky
Tom
- Occupation
- EC - retired
$$$$$ to $$
the blur
Senior Member
- Location
- cyberspace
That would be a problem in a retrofit. I have 5 wall packs lighting a parking lot. Installing a ballast kit would keep things looking "equal". and security is most important for women walking the lot at night time, so it needs to be well lit at ground level.
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
I would check the photometrics of the particular wall pack that you are looking at and compare it to the existing one.
BullsnPyrs
Senior Member
- Location
- Saint Joe, Arkansas
If the LED wallpack was undersized the light wouldn't have reached the ground. An appropriately sized LED and designed wallpack can outperform HPS and save money over the life of the fixture. An additional benefit is the higher CRI is more camera friendly for sites that are monitered by security cameras and the human eye will percieve a higher light level when the same number of lumens are measured.
- Location
- Bremerton, Washington
- Occupation
- Master Electrician
You need to compare lumens to lumens, and not watts, and as pointed out run a photometric plot that will tell you the lumens at various points on the ground. Also critical is min to max and min to avg. There are standards for parking lots published by the IES. Your lighting rep should be able to assist you with this. I did a project with LED wall packs and parking lot lights, they were controlled by motion sensors and went from low to hi. Significant energy savings with this. The LEDs luminaires have a whiter light and the eye can see better with the white light, so less light is needed.
IES now has a standard to determine the LED life, it was just released Sept 2011 so its working its way into spec sheets.
IES now has a standard to determine the LED life, it was just released Sept 2011 so its working its way into spec sheets.
@Tom, you can't really compare lumens. I've done a couple LED projects and measuring lumens, which seems to make sense, never does. I posted a white paper I wrote on that subject on this site some months back.
Rab says their 78 Watt product can replace a 250, not a 400 watter. If you really need to get a ton of light and save some cold hard cash, you can go T5 wallpacks. Xtralight and Precision Paragon make T5 wallpacks/floods. And Metrolight makes a great electronic metal halide product.
Rab says their 78 Watt product can replace a 250, not a 400 watter. If you really need to get a ton of light and save some cold hard cash, you can go T5 wallpacks. Xtralight and Precision Paragon make T5 wallpacks/floods. And Metrolight makes a great electronic metal halide product.
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