P2 in Lighting Opportunity #3 - T12 vs. T8 or T5
Tubular fluorescent lamps are widely used for indoor lighting in commercial, institutional, industrial and even residential spaces with ceilings less than 15 feet high.
Depending on the diameter of the lamp, tube fluorescent lamps are usually identified as T12, T8 and T5 (12/8, 8/8 and 5/8 of an inch tube diameter).
As interest in energy saving technologies has grown and become popularized, these codes have come to designate levels of energy efficiency, instead of merely indicating lamp tube diameter. In general,
- T12 = old and inefficient, 57 lumens/watt, 62 CRI, lowest lamp, ballast and fixture cost
- T8 = higher efficiency, 92 lumens/watt, 85 CRI, approx. 20% more expensive than T12
- T5 = highest efficiency, 103 lumens/watt, 85 CRI, 3-4 times the cost of T8
Retrofitting T12 with T8 or T5 not only result in significant energy saving (typically greater than 40%) but also improves the quality of lighting! T5 is the most efficient lamps among the three, however, it is important to look at the application and determine the cost benefit of T5 over T8 in order to determine if the increased efficiency of T5 justifies the substantial increase in initial and long term maintenance costs. The standard 32 watt T8 and an electronic ballast with a low temperature rating, are proven performers in a wide array of extreme applications. The systems are tried, tested and true in parking garages, factories, extreme cold environments and the list goes on. T5's don't have the track record in extreme applications. It is believed that the manufacturers are still "working out the bugs" as the largest portion of our warranty work involves defective T5 lamps and ballasts.
Furthermore, T8 lamps and ballasts are now commodity items and can be purchased at low costs. T5 is still a premium product, whose research and development costs haven't even been fully realized, let alone the process to produce low cost, highly reliable, replacement parts.
P2 in Lighting Opportunity #4 – High Bay Metal Halide vs Fluorescent
High bay fluorescent is a great P2 alternative for metal halide! In recent years, both HID and high bay fluorescent technologies have improved, but high bay fluorescent technology has retained a performance edge in most applications, and it continues to gain market share. The improvements in fluorescent lamps and the emergence of new high bay fluorescent fixtures have made fluorescent lighting the most cost-effective choice for lighting high indoor spaces. These high bay fluorescent systems are more energy-efficient than HID solutions and feature lower lumen depreciation rates, better dimming options, virtually instant start-up and restrike, better color rendition, and reduced glare.
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