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Question: Where can I find brief hospital light design details?īarrett Newell: RP-29-16 Lighting for Hospital and Health Care Facilities This will allow for simple cleaning of the outside of the fixture for removal of any dust, without allowing dust inside the fixture. Question: What is the solution for lighting maintenance in industrial dusty environment?īarrett Newell: Gasketed or sealed fixtures should be considered in dusty environments.
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Manufacturers track the lumen output and color temperature based on serial numbers so that if the source needs to be replaced, a consistent board can be provided. Question: Can you touch on how the LED is replaced in an integrally LED luminaire when it fails?īarrett Newell: Most integral LED fixtures have a removable LED board that can be replaced down the line - this includes point source (i.e., downlight) or linear. Or you can use the Lumen Method of calculating lumen output on the surface based on the information provided on a fixture cutsheet. Most of them have staff in-house that are able to make fixture selections and run calculations to ensure that the appropriate fixtures, wattage and light levels are met.
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How do I know I’m picking the correct fixture and number of fixtures, spacing, etc.?īarrett Newell: My recommendation would be to talk to a local rep agency. Question: From time to time I am asked by an architect to layout 2×4 lighting to an office or corridor, and I’m an electrical engineer who doesn’t use any lighting design software. Transfer switches are used to transfer the power source of the emergency circuit from normal power to backup power in the event of normal power loss.
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Most often when a generator is used, I specify UL 1008 devices. Michael Chow: I work with the client to determine if they want battery backed emergency lighting or if they will utilize a life-safety emergency generator.
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Question: How did you address controls in relation to emergency egress lighting code requirements? Did your design use UL 1008 branch circuit relays to transfer to emergency circuit? However, network occupancy sensors could allow remote overrides, time of day shut-off, etc.
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For example, typically, it is more cost-efficient to install stand-alone occupancy sensors in private offices than it is to install networked occupancy sensors. Michael Chow: It depends upon the client’s budget and if they require networked lighting control systems. Question: Based on your lighting controls budget during your design development phase of most of your everyday projects, are you looking more into stand-alone room controller specification options or more into the larger budget of network lighting control systems? By throwing light up on to the ceiling, as well as directly down, the contrast ratios in the space were decreased, making the whole space “easier” to look at. Direct/Indirect volumetric troffers were used to reduce glare in offices, while an indirect component was used in the linear fixtures in the waiting area. Question: Do you find indirect light fixtures to be easier to look at? For instance, in the autism building with a lower color temperature like 2,700 K and indirect lighting, would it be a better design?īarrett Newell: Indirect fixtures can provide a lower glare lighting solution. Traditional sources like halogen, fluorescent and incandescent lights have a higher UV content. Question: Are the LED sources the best source for the low ultraviolet application used in the New York library case?īarrett Newell: Yes, LEDs are by nature very low in UV light, making them a great source for this kind of delicate material.
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This should allow you to use the 11 watts for the energy calculation.
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Typically, this will be allowed if a permanent label is installed on the fixture (and the existing label removed) that states maximum wattage of 11 watts for replacement lamp. Michael Chow: Check with the authority having jurisdiction and/or electrical inspector to determine if this is allowed. Question: If an 11-watt LED lamp is installed in a conventional downlight and the downlight is rated at 100 watts, is the incandescent light able to be rated at 11 watts for energy calculation or does the 100-watt rating need to be used? Applies to most spaces in ASHRAE 90.1-2013 and only spaces with timer control in IECC 2015.
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For example, manual controls for lighting are required to provide at least one control step between 30% and 70% plus full on and off. It is recommended to review the requirements of each code if budget is a consideration. Both IECC 2015 and ASHRAE 90.1-2013 allows for manual on or automatic on to no more than 50% of the general lighting. Michael Chow: The ASHRAE 90.1 that would be compared against IECC 2015 is ASHRAE 90.1-2013.