 | nptv.npenn.org North Penn High School's Energy Troopers provide this Green Team tip of the week - "Using High Efficiency Lamps to save Energy" | From:NPTV Views: 3  0 ratings |
| Time:00:38 | More inEducation |
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| nptv.npenn.org North Penn High School's Energy Troopers provide this Green Team tip of the week - "Using High Efficiency Lamps to save Energy" | From:NPTV Views: 3 0 ratings |
| Time:00:38 | More inEducation |
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