Show Menu
Cheatography

When Linear LEDS are Cost Effective Cheat Sheet (DRAFT) by [deleted]

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Introd­uction

LED retrofits are efficient and effective replac­ements for linear fluore­scent lamps in troffer fixtures, but may not be cost-e­ffe­ctive for FMs who need a short payback period, the GSA notes in a recent field test of linear LED retrofit products.

Energy Efficiency
Installed techno­logies and conditions varied widely at the project sites, the GSA notes in its project findings. Mixes of nominal and reduced wattage lamps, two- and three-lamp fixtures and varying ballast techno­logies and manufa­cturers were common, making it difficult to compare the LED replac­ements against the old fixtures. The readings were normalized for analysis by assuming the high end of the indust­ry-­acc­epted range in wattage for two-lamp T8 fixtures with electronic ballasts (60W) as the pre-re­trofit condition.

When Linear LEDs Make Sense

Product efficacy: Refer to existing lighting program requir­ements to set minimum efficacy criteria, then screen product options against those needs.
Light delivery: Ensure that the replac­ement will provide approp­riate lighting for the tasks in each space. You may have to measure the existing conditions or conduct modeling exercises to make sure post-r­etrofit light levels are reason­able.
Light distri­bution: LEDs are direct­ional, unlike fluore­scent lamps, which can create uneven, unappe­aling light patterns.
Product useful life: The replac­ement should last as long or longer than the existing lamp. Many LEDs have the potential to last longer than fluore­scent lamps and are typically rated with high lifetimes, but before you take the plunge, consider whether that long life will actually be used. If the space may be reconf­igured soon or has a low lighting use time, a very long-life product may not be worth it.
Lighting color: LEDs come in color temper­atures similar to fluore­scent lamps. The GSA recommends choosing LED lamps with the same color temper­ature as the previous fluore­scent lamps.
Instal­lation time and cost: LED direct lamp replac­ements cost more than fluore­scent lamps and the labor costs can vary widely. Depending on how much rewiring is needed, a new LED fixture might be just as affordable as a replac­ement kit.
Instal­lation capabi­lity: Make sure the existing system has the right ballast type to operate the LEDs – usually an electronic instan­t-s­tart. Determine whether the existing optical system is easily removable, how the ballast is accessible and how difficult it is to access, what type of ballast is required and how many sockets are installed.
Mainte­nance: Longer lifetimes mean signif­icant savings from fewer replac­ements, so include reduced mainte­nance in cost & budget proposals.
 

LED Economic Assessment

LED-A and B used 44W and 42.9W respec­tively, indicating a savings of 26.7% and 28.5% over the assumed 60W baseline

Tips for Hig-Bay Lighting

If you have a warehouse, meeting space or superm­arket in your portfolio, you’re probably aware of the cost and complexity of high bay lighting applic­ations. Finding the right fit for these spaces is a challenge, but the long life and low mainte­nance needs of LED lighting may be a good match for your facility. Ensure a successful LED retrofit with these tips.

1) Use the same base config­uration

Before you start weighing any other product specif­ica­tions, make sure you’re only looking at lamps with the same base (such as metal halide base E39 or incand­escent base E26 medium), as well as the same aesthetic effect, the Department of Energy recomm­ends. This will ensure that your new LED lamps produce roughly the same amount of light while consuming less energy.

2) Consider control strategies

LEDs dim easily and work well with lighting control systems, which can be very useful in tricky lighting situations where a couple of light switches won’t cut it.

3) Know your usage patterns

Understand where and how each space uses lighting to find additional opport­unities for your LED lighting to save money.