I am going to recommend replacing the old 400 w. M-V fixtures in a lumber storage warehouse with either 250 watt Metal-Halide or 250 watt High Pressure Sodium. According to the owner, color rendition is not TOO important, but maintenance costs are. I'm considering the HPS due to the lamp life being 24,000 hrs. versus 10,000 hrs. for the M-H. I'm just not too sure how bad the poor color rendition will look. I have used M-V and M-H in the past. Has anyone used HPS for warehouse lighting and been satisfied with the results?
I've used HPS lighting for an large indoor warehouse at a lumber yard. The color doesn't seem to be a problem to them. The products kept in the area are dimensional lumber, plywood, metal brackets, and the other "rough stuff" All the molding, hardwoods, veneers... that color or finish is an issue are in a separate area, and are lit either by MH or 50K Fluorescents. It all works very well.
I am going to disagree with Electure. I have worked in a number of warehouses that had HPS lighting, and it simply is horrible- most unpleasant for the eyes. This is especially true with the various poorly printed forms using colored paper that you commonly deal with....orders, packing slips, etc.
I would also like to introduce another option. I recently, as a test, replaced a 400w MH fixture, mounted 22+ ft. up, with a fixture that used 5-54w T-5 flourescent lamps. More light, better distributed, without the warm-up period needed by HID- and for half the electric, minus the heat! Since there is essentially no warm-up period, such lights could also be locally controlled- say, by a motion sensor- to light up an area only as needed.
I'm going to side with renosteinke here. T-5 Fluorescents are making a good case for their replacing traditional Low and High-bay lights. They are virtually shadowless, being run on HF Ballasts also means that they don't cause the same Stroboscopic effect as their predecessors, around rotating machinery. The new T5 tubes also have a life of around 16,000 hrs. More importantly, if there is a power sag and the lights go out, you don't have to wait for the bulbs to cool down before they will re-strike. Redsy, I'm not really a great fan of HPS lighting, we use it over here for Streetlighting and we are in the process of upgrading to M-H lighting. The change in lighting at night, is beyond belief!.
I have to agree with renosteinke. I work for a county school board and we have plenty of each. For an inside facility where you have to read labels and just generally exist I'd take MH every time. For an outdoor facility, where the glare and color disturb the neighbors I'd take the HPS. In a nutshell ... parking lots work better in HPS but gymnasiums work better with MH. We have the new no delay MH bulbs now also. They come to life as quickly as an incandescent when turned off & on; NO delay.
Redsy: A little late in putting in my 2 cents, but... When I have a situation like yours, I 'hang' a sample fixture! Let it burn for a week, get opinions, a nod or nay from the guy that is signing the check, and it becomes the client's decision.
That said, the T5 fluorescents are making a big in-road into the warehouse market, along with multi-level and motion sensors.
Personally, HPS is not my prime choice, MH is, and check your info on the rated life, MH 400 watt is 20K hrs also.
Lastly, you know there is a retro bulb, MVR400/U/ED28/R, THAT YOU CAN JUST SCREW-IN? 20k HRS; $82 in WWG cat #392. (4WW46)
I just visited the cooper warehouse in Peachtree City, and they had several types of lighting, with the newest being the t-5, 6 or 8 blub fixture, replacing a MH on a one for one basis. The light was great. In our warehouse we have t-8 and they are from 30-35 ' in the air. They provide better lighting than the MH we had. We learned the hard way, if you want to use sensors, the the rapid start ballast are not the way to go. We are getting about half life from the tubes. Our next retrofit, whitch begins next week, we are useing t-8 with a programed ballast, with is suposed to give us another 50% of tube life.
"Yes I am a Pirate, 200 years to late" Jimmy Buffett
Redsy, I do service work for a warehouse that converted their lighting to the T-5 fixtures. The fixtures are 35' above finished floor. I am amazed at how bright the warehouse is now. They removed HPS High Bay fixtures. Try one out like Hotline suggested. Al