Choose the right lighting solution on your top ceiling environment. Saving more cost in maintenance and electricity.
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| T8 | T5 | MH LEDT8 | ||
Energy Efficiency
|
85lm/w
|
90lm/w
|
77lm/w
|
110lm/w
|
Life Expectancy
|
10000-16000h
|
20000-30000h
|
10000-16000h
|
30000h
|
Initial Cost
|
High
|
High
|
Low
|
High
|
Cost of Maintenance
|
High
|
Low
|
High
|
Low
|
Temperature Performance
|
Poor
|
Poor start at low temperature, low lumen output when outside of range 20-45C
|
Good
|
Very Good
|
Color
|
Good
|
Good
|
Moderate to Good
|
Good
|
Light Distribution
|
Moderate to Good
|
Moderate to Good
|
Good
|
Moderate to Good
|
Lamp Lumen Loss overlifetime
|
High
|
Low
|
High
|
Low
|
Dimming control
|
None
|
Good 0-10v
|
None
|
Good: 0-10v
|
On/Off Control
|
Need 50s delay
|
Instant On/Off
|
Need 15 min delay
|
Instant On/Off
|
High Bay Retrofit Applications
|
Moderate
|
Moderate
|
N/A
|
Good
|
Low Bay Applications
|
Moderate
|
Moderate
|
Moderate
|
Good
|
Parking Garage Applications
|
Moderate
|
Moderate
|
Moderate
|
Good
|
Area Lighting Applications
|
Moderate
|
Moderate
|
Moderate
|
Good
|
Mercury
|
Yes
|
Yes
|
Yes
|
None
|
As shown in below table, a 4-lamp F54 T5HO fixture can replace a 400w MH fixture, for example, and save about 50% on energy while producing about 20% less maintained light output. A 6-lamp LED T8 fixture can replace the same 400W MH and save about 50% on energy while producing about 16% less maintained light output.
MH with Magnetic Ballast
|
T8 Lighting Systems
|
T5HO Lighting Systems
|
LED T8 Lighting Systems
| |
No. Lamps
|
400w Probe-start MH
|
8 F32T8 Fluorescent
|
4 F54 T5HO Fluorescent
|
6 X 30W LED T8
|
Service Life
|
20,000hours@ 10hours/start
|
20,000 hours@ 10hours/start
|
24,000hours@ 10hours/start
|
30,000hours/10hours/start
|
Initial lamp light output
|
360000lm
|
18000lm
|
20000lm
|
19800lm
|
Ballast
|
Probe-start Magnetic
|
Instant start
|
Program start
|
NO
|
Ballast Factor
|
1.0
|
1.0
|
1.0
|
No
|
Lamp Watts
|
400w
|
256w
|
216w
|
183w
|
System Watts
|
458w
|
286w
|
234w
|
183w
|
Relative System Watts
|
100%
|
64%
|
51%
|
46%
|
Initial system efficacy
|
79lm/w
|
85lm/w
|
85lm/w
|
110lm/w
|
Lumen Maintenance
|
65%
|
95%
|
95%
|
98%
|
Mean Lumens
|
23400lumens@40% of lamp life
|
17100lumens @ 40% of lamp life
|
19000lumens @ 40% of lamp life
|
19404lumens @ 40% of lamp life
|
Relative maintained light output
|
100%
|
73%
|
81%
|
83%
|
Maintained system efficacy
|
51lm/w
|
81lm/w
|
81lm/w
|
108lm/w
|
Color rendering
|
65CRI
|
82-85CRI
|
82-85CRI
|
85CRI
|
Starting Time
|
4 minutes
|
<1.5seconds
|
<1.5 seconds
|
<1second
|
Re-strike Time
|
10 minutes
|
<1.5seconds
|
<1.5 seconds
|
<1second
|
Color temperature
|
3000-4000K
|
3000-5000K
|
3000-5000K
|
3000-5000K
|
Mercury
|
Yes
|
Yes
|
Yes
|
None
|
5years Electricity cost
|
US$125500
|
US$78300
|
US$64100
|
US$50000
|
Cost comparison – e.g. 100set project, working @ 10hrs/day, electricity cost US$0.15/KWH
MH with Magnetic Ballast
|
T8 Lighting Systems
|
T5HO Lighting Systems
|
LED T8 Lighting Systems
| |
No. Lamps
|
400w Probe-start MH
|
8 F32T8 High LumenFluorescent
|
4 F54 T5HO Fluorescent
|
6 X 30W LED T8
|
System Watts
|
458w
|
286w
|
234w
|
183w
|
Service Life
|
20,000hours@ 10hours/start
|
24,0000 hours@ 10hours/start
|
24,000hours@ 10hours/start
|
30,000hours/start
|
Initial investment
|
US$18000
|
US$24000
|
US$20000
|
US38000
|
1st year electricity cost
|
458*10*365/1000w*0.15=251
|
286*10*365/1000*0.15=156.6
|
234*10*365/1000*0.15=128.2
|
183*10*365/1000*0.15=100
|
…………
| ||||
5th year electricity cost
|
458*10*365/1000w*0.15*5=1255
|
286*10*365/1000*0.15*5=783
|
234*10*365/1000*0.15*5=641
|
183*10*365/1000*0.15*5=500
|
Ballast and bulbsMaintenance/2years
|
US$50
|
US$30
|
US$30
|
None
|
5year Labor Maintenance
|
US$100
|
US$50
|
US$50
|
None
|
2nd investment
|
US$900
|
US$
|
•T8 Vs. T5HO: Regarding fluorescent, the choice is T5HO or LED T8. Lighting professionals may hear that T8 fixtures are better at fixture heights <20 ft., T5HO at >20 ft., and either T8 or T5HO at 18-25 ft. mounting heights. However, while T5HO may produce “glare bombs” at lower mounting heights, both T8 and T5HO can be used in high- and low-bay applications.
•T5HO lamps produce about twice the light output of a standard T8 or T12 lamp in approximately the same length and a fraction of the diameter, making them very bright. While they produce less light than a standard MH lamp, they have 95 percent lumen maintenance compared to 65 percent for a standard MH. This means a six-lamp F54T5HO system produces about 83 percent of the initial light output of a 400W MH lamp, but 121 percent of its light output at 40 percent of lamp life.
•For bay applications, standard T8 lamps are generally not used. Instead, F32T8HO, or Super T8, are used. Super T8 lamps produce 3100+ lumens; when operated on a high ballast factor (1.15) ballast, this system can produce 3,565 lumens, 71 percent of the light output of a comparable F5
•Besides light output, ease of replacement should be considered. To get higher light output from a T8 fixture, Super T8 lamps should be specified, but the owner may substitute to lower-output (and less expensive) T8 lamps that may be used elsewhere in the facility such as offices. This will result in lower light levels than expected. T5HO and Super T8 lamps are typically offered only by electrical distributors.
•T5HO and T8 lamps are sensitive to ambient temperature in the fixture’s ballast compartment. T5HO is designed to operate optimally at higher temperatures (35 oC or 95 oF) and T8 at lower temperatures (25 oC or 77 oF).
•In addition, the presence of occupancy sensors and other switching strategies is a factor in whether to choose T8 or T5HO. If occupancy sensors are used and the lamps are frequently switched, lamp degradation will occur after 12,000 to 15,000 switching cycles on a T8 lamp operated on an instant start electronic ballast, the most common T8 ballast type. Some lamp manufacturers may not warranty their T8 lamps when operated on instant start ballasts and controlled by occupancy sensors. Super T8 lamps, however, are rated to last 4,000 hours longer than T5HO lamps.
On the other hand, T5HO lamps are operated with programmed start ballasts, which are generally more expensive and are wired in series or series-parallel compared to parallel for instant start ballasts.
More information about the led high bay fluorescent, please contact us by sales@bomaxs.com
