Re: power consumption
1- take your total connected wattage, and divide by 1000...this puts us in kW (Remember that a 250W MH ballast consumes more than 250W...see the spec sheet for the exact amount)
2- Multiply your total kW from above by your utilities kW/Hr rate. THis gives you dollars per hour.
3- Multiply by however many hours you are going to run them to see your total cost for that period of time. This gets uglier though when we factor in time of day rates, and multi-level rates. See your utility
If they really want to go with MH, have they factored in the inevitable color shifts that occur over time, even with ceramic MH? Have they thought about the restrike time in the event of a power interuption. They'll have to add in other types of sources, or a UPS system to maintain 1 FC at the floor for egress purposes. Unless they use electronic ballasts (highly recomended), you'll have the "buzz" as things age.
250W seems like a lot of light, but then again, how big is the ceiling space??? I'd look at T-5 asymetric fixtures (check out eliptipar's website), use T5HO bulbs for the maximum brightness. If you are going for color changning, LED's are great, but you'll need a lot to get good brightness and they aren't cheap. I had them quoted for a 16' long barrel vault once, both sides illuminated, and the whole system was around $4000 in parts. Of course, not having to change lightbulbs for 20+ years is pretty cool. A company called Martin makes color changing fixutres that use T5HO bulbs with color filters. ERCO makes something similiar as well.
mike
mike
[ December 09, 2005, 01:37 PM: Message edited by: mhulbert ]
