R.L Vanstory Lighting Company

R.L. Vanstory Lighting and Electrical Products

Recently my Lighting Design class visited R.L. Vanstory Lighting Company in Greensboro, NC.

The company was founded in 1977. It is has had a significant impact on the lighting industry of central North Carolina.

What was gone over in their presentation to us, is directly linked to what were are currently studying. CRI, lamp types,light pollution, ballasts, and legislation codes that affect lighting design of commercial construction.

• 60 CRI is bad for color rendering of textiles
• higher CRI cooler the color rendering
• for incandescent 91% of the energy is lost in the heat it produces
• Incandescent best because of CRI 100, butt worst in efficiency
• CRI color temperature is listed on fluorescent bulbs
• blue color temperature is hot, 3100K or higher rating
• fluorescent bulbs are available in T12, T5, T8 tubular
• the number following the T on fluorescent lamps indicates the diameter of the tubular lamp
• example: T5 has a diameter of 5/8" (always measure in 1/8" of an inch)
• the mercury level in the tubular fluorescent with the green tips is less than the silver tip
• office buildings cannot exceed 1 watt per sq ft
• Energy Policy Act was passed in 2005. It gives incentives for companies to upgrade their lighting to something more efficient
• metal halides are good outdoor lighting source. They are very efficient. They are used in grocery stores and home centers. They take a while to startup.
• Fluorescent lamps last longer the less you turn then on then off.
• An Electric Ballast of a fluorescent lamp starts the lamp & limits the electrical current during the on cycle.
• 1,2,4 & 6 ballast are common
• Automatic shut off is part of electrical code
• Lighting pollution depends opn the angle off light
• Watts is relative to BTUs. For every watt consumed that wattage/btu is dumped in the environment.
• If you reduce number of watts, you can reduce the size of the HVAC system. Every 4 watts of lighting energy saved, 1 watt of the HVAc you save.
• Lamps can help heat a space
• Heat for Flood LED lamps collects at the back ofthe bulb
• LEDs do have color temperature in degrees Kelvin. 6000K give off bluer light temperature. 2700K give off warmer light temperature
• Some LEDs use a phosphor
• Once a LED light output gets below 75% it will give out
• Meaure of the output of a lamp is in luminance

Elliptapar: Melanie Naomi

• The elliptapar is based on a reflector used to light the Jefferson Memorial.
• 25 degrees above the horizontal is perfect reflector of light
• Circular and Parabolic reflectors are for a single focal point.
• Elliptical section of the elliptapar gives you teo focal points
• Elliptapar includes the elllipse and 2 parabolas. Its a reflector the company invented.
• Asometric Lighting or Wall Washing. It is indirect illumination. It enhances the perception of space and lighting. It improves visual comfort. This low level of illuminance used of even light. It focuses the viewers attention. It can also direct movement, ex: in airports to direct visiters.
• Why light a ceiling? It enhances architure. The fixture is tucked away. It is indirect illumination. IT improves visual comfort. Frees ceiling of clutter.