More Information on Linear Fluorescent Lighting
What are High-Performance T8 (HPT8) systems?
High-Performance T8 (HPT8) refers to a lamp and ballast combination that can be purchased within a new fixture or can be retrofitted into an existing T12 or T8 light fixture. HPT8 systems provide an energy-efficient lighting solution compared to standard T8 or T12 light fixtures.
HPT8 systems are comprised of two components: a high lumen, long life T8 lamp and low-power electronic ballast. This combination delivers equivalent or higher light output compared to T12s or standard T8s, produces high-quality light and uses less energy. High lumen, long life HPT8 lamps are rated at 3100 initial lumens (light output) and 24,000 hours (life). Low power HPT8 ballasts are defined as electronic ballasts having 0.78 or lower ballast factor.
How are HPT8 systems better than T12 or standard T8 systems?
- HPT8 systems can save 20% in energy and operating costs compared to standard T8 and up to 50% compared to T12.
- HPT8 lamps are extended-life lamps, typically rated to last 4,000-10,000 hours longer than standard T8 or T12 lamps. That means less time changing light bulbs and reduced maintenance costs!
- HPT8 lamps provide better color rendering. Measured on the color rendering index (CRI), a scale of 0 to 100 that indicates how well a light source renders colors, HPT8 lamps are rated at a minimum of 82 CRI. Comparatively, most standard T8 lamps have a CRI rating in the 70-80 range and T12s typically in the 60-70 range.
Are T5 systems better than HPT8?
T5 and HPT8 lamps are both highly efficient light sources. An HPT8 system—accounting for both the lamp and ballast—is slightly more efficient than a T5 system. For most standard fixture types and applications, an HPT8 system is recommended due to higher efficiency and lower equipment cost. There are, however, certain applications that are better suited to T5 systems. For example, it is best to use a T5 “high-output” system in applications with a mounting height greater than 25 feet. Also, certain T5 “high-efficiency” fixtures are available that have been designed to take advantage of the T5 lamp dimension. These fixtures can potentially replace a standard three lamp T8 fixture while only using two T5 lamps, thus saving energy. Your contractor can help you identify the best lighting solution—T5 or HPT8— for your needs.
What are ballasts?
Fluorescent and HID (high-intensity discharge) lamps require ballasts to apply starting voltage to the lamp and to establish current flow. Ballasts regulate current and power. Ballast types fall into two categories:
- Magnetic ballasts are often found in HID and older florescent fixtures. They are simple devices that are noisier and use more power than the newer electronic ballasts. Magnetically ballasted lights can also have a noticeable "flicker.”
- Electronic ballasts are lighter, smaller, and quieter and offer more energy efficiency.