Electric-Light
Senior Member
If you currently have 400W MH 455W input, you could save energy use by using another technology. Your HID would be one of these two types.
A: Pulse Start
B: Probe Start
Pulse start has a better lumen maintenance and if it was already designed to take advantage of this, you likely need to match with 24,000 to 25,000 lumens. 5 T5HO/8 T8
Probe start lamps have a poorer lumen maintenance and then can generally be substitute by 18,000 to 20,000 lumens. This is made possible due to higher lumen maintenance and better fixture efficiency of alternative technologies. You'd beed 4 T5HO or F32T8 x 6 (high BF)
To use LED or traditional fluorescent?
Available control options: all lamps on or partially off, step dimming or full range dimming. Dimming is not exclusive to LEDs.
6 lamp T8:
This example is 91.1% efficient, cost is <$150 with lamps.
http://www.visual-3d.com/tools/photometricviewer/default.aspx?id=30954
Life hours comparable with LEDs is possible with special long life 28W lamps when usage under 60F is not needed. Doing the math, your expected performance is around 187W with 17,100 Lm output
https://www.platt.com/CutSheets/Philips/P-6049-E 2XL EA T8 28W bulletin_v1_web.pdf
214W with 20,000 lm delivery using F32T8/HL 32W Super T8 lamps. Require re-lamp at 20-25K hours of use. (rated life to 50% failure is 30-36K)
4 lamp T5HO: about $150 with lamps
The Best 54T5HO performs comparably with Best T8. Howard HFB FE454 with 51W/5,000 lm Super T5 lamps provide 210W input with 18,900 LM delivery
LED: 200W/19,000 lm ($450-500 ea)
http://www.acuitybrandslighting.com/library/ll/documents/specsheets/ibh.pdf
Lumen maintenance prediction: L90:25,000, L80: 60,000
Output sharplyplummets above 95F. At the mounting height high bays are used, the air temperature at the fixture will probably be above that in the warm season unless it's a fully conditioned space. Under those conditions, I would use Philips Extreme Temperature T5 in those.
The price difference between 4 and 6 lamp T5HO fixtures is not significant. When you need 24,000 or 30,000 lumen class output, the price difference between LED and fluorescent will widen, because LEDs become more expensive with increasing lumen output. Modern T5 fixtures are parallel wired as are T8 fixtures, so one lamp failure will only black out one lamp which maintains enough light output until scheduled maintenance.
LEDs and fluorescent can both suffer a ballast failure, so LEDs do not get any advantage here.
The actual maintenance savings of LEDs compared to T5HO or T8 is not yet proven. It's good to be aware that as of now, the performance difference between higher end LED and high performance fluorescent is negligible.
Both fluorescent and LED allows immediate power cycling, a switch to LED from fluorescent do not add any advantage i this regard. Many 4 or more lamp T5 systems have dual circuit ballast so they may have two hots and support step-dimming you maybe able to task it for your next scheduled re-lamp.
The power and demand savings from 455W/ea to about 220W/ea is significant. But when you pay substantially more to lower the power to 180W, you're probably not getting as good of value. Commission structure tied to selling price motivate sales people to sell the higher priced LEDs, but it might not save YOU money as efficiently. Not all fixtures are the same. Select the correct type. (narrow, wide or medium? ) (lots of uplight or no?)
A: Pulse Start
B: Probe Start
Pulse start has a better lumen maintenance and if it was already designed to take advantage of this, you likely need to match with 24,000 to 25,000 lumens. 5 T5HO/8 T8
Probe start lamps have a poorer lumen maintenance and then can generally be substitute by 18,000 to 20,000 lumens. This is made possible due to higher lumen maintenance and better fixture efficiency of alternative technologies. You'd beed 4 T5HO or F32T8 x 6 (high BF)
To use LED or traditional fluorescent?
Available control options: all lamps on or partially off, step dimming or full range dimming. Dimming is not exclusive to LEDs.
6 lamp T8:
This example is 91.1% efficient, cost is <$150 with lamps.
http://www.visual-3d.com/tools/photometricviewer/default.aspx?id=30954
Life hours comparable with LEDs is possible with special long life 28W lamps when usage under 60F is not needed. Doing the math, your expected performance is around 187W with 17,100 Lm output
https://www.platt.com/CutSheets/Philips/P-6049-E 2XL EA T8 28W bulletin_v1_web.pdf
214W with 20,000 lm delivery using F32T8/HL 32W Super T8 lamps. Require re-lamp at 20-25K hours of use. (rated life to 50% failure is 30-36K)
4 lamp T5HO: about $150 with lamps
The Best 54T5HO performs comparably with Best T8. Howard HFB FE454 with 51W/5,000 lm Super T5 lamps provide 210W input with 18,900 LM delivery
LED: 200W/19,000 lm ($450-500 ea)
http://www.acuitybrandslighting.com/library/ll/documents/specsheets/ibh.pdf
Lumen maintenance prediction: L90:25,000, L80: 60,000
Output sharplyplummets above 95F. At the mounting height high bays are used, the air temperature at the fixture will probably be above that in the warm season unless it's a fully conditioned space. Under those conditions, I would use Philips Extreme Temperature T5 in those.
The price difference between 4 and 6 lamp T5HO fixtures is not significant. When you need 24,000 or 30,000 lumen class output, the price difference between LED and fluorescent will widen, because LEDs become more expensive with increasing lumen output. Modern T5 fixtures are parallel wired as are T8 fixtures, so one lamp failure will only black out one lamp which maintains enough light output until scheduled maintenance.
LEDs and fluorescent can both suffer a ballast failure, so LEDs do not get any advantage here.
The actual maintenance savings of LEDs compared to T5HO or T8 is not yet proven. It's good to be aware that as of now, the performance difference between higher end LED and high performance fluorescent is negligible.
Both fluorescent and LED allows immediate power cycling, a switch to LED from fluorescent do not add any advantage i this regard. Many 4 or more lamp T5 systems have dual circuit ballast so they may have two hots and support step-dimming you maybe able to task it for your next scheduled re-lamp.
The power and demand savings from 455W/ea to about 220W/ea is significant. But when you pay substantially more to lower the power to 180W, you're probably not getting as good of value. Commission structure tied to selling price motivate sales people to sell the higher priced LEDs, but it might not save YOU money as efficiently. Not all fixtures are the same. Select the correct type. (narrow, wide or medium? ) (lots of uplight or no?)