Re: [Chevelle-list] off topic garage lighting

[Brad Waller]

There you go, an even better answer than I made, because you have real numbers and light output (which I forgot).   Brad From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dean Vandergriff Sent: Friday, November 03, 2006 11:18 AM To: The Chevelle Mailing List Subject: Re: [Chevelle-list] off topic garage lighting Harlan,             I do lighting design work for a fluorescent fixture manufacturer.   There is more than one type of both T12 & T8 lamps.  If your friend is using an F96T12HO lamp, two of them have a system wattage of 216 watts & around 9000 lumens per lamp.   F96T12 slimline is actually a 75 watt lamp with a system wattage of 158 & around 6300 lumens per lamp.   These are both 8’, T12 lamps & my wattage figures are based on magnetic ballasts (most likely for older fixtures).  Incidentally, both of these lamp types are rated for 12000 hours per lamp.             T8 slimline lamps are a 59 watt lamp & have a system wattage for two lamps of 110 watts, are rated at 5950 lumens per lamp, & a 20,000 hour life.  The 86 watt T8 HO has a system wattage of 160 watts, 8200 lumens per lamp, & 18,000 hour life.                  The 4’, 32 watt T8 lamp is rated for 20,000 hour life & you can operate 4 of them on a single ballast at 114 watts & 2950 lumens each.             All of my figures for the T8 lamps are based on solid state, electronic ballasts.  Four of these is a good replacement for two of the 8ft, T8 slimline lamps.   You can get the same light output at about the same energy cost & you’re buying a less expensive lamp that’s easier to store & dispose of since it’s only a 4’ lamp.             Bottom line, be sure of what you’re comparing.  You could replace T12HO with T8 slimline fixtures & save about 50% on electricity, but then you’d only end up with about 2/3 of the light that you started with.   Regards,   Dean Vandergriff Applications Manager H.E. Williams, Inc. From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Friday, November 03, 2006 12:25 PM To: Chevelle-list@chevelles.net Subject: [Chevelle-list] off topic garage lighting   hi wondering if there are any electricians out there who know if this is true, a salesman told my friend he could switch his fluorescent lights from a T12 to a T8 type of light and he could save $1179.00 a year on his light bill and have more light with the same ammt of fixtures (13).  I priced the fixtures out and they are 24.00 more per light (twin 8' tube) or 6.00 more per light for a 4-tube- 4' bulb light. I need about 90 of them for my shop so the cost on the light fixtures would be a lot more, but if this savings on lighting bills is true maybe it would be worth it?? (my friend owns a small muffler shop so the lights are on at least 8 hours a day). they claim the wattage on his fixtures are 490, and the new fixtures are 166.   thanks for the help.   Harlan