The other night I counted about 20 exterior garage light fixtures that were dark so the next day I purchased some more 40 watt incandescent replacement bulbs on behalf of the condo association. Tonight I inspected each of the dark fixtures and found that 15 of them had burned-out bulbs (6 of these were
compact fluorescent bulbs, which makes one wonder about the claims for their superior longevity). The remaining dark bulbs had been partially unscrewed and I twisted them fully into their socket so that they are providing light again.
The condo association is responsible for the maintenance of the exterior garage lights and their photocell switches while the co-owners are responsible for providing the electricity to light the bulbs. The light from the exterior garage fixtures enables emergency responders and your own visitors to quickly and easily find your address at night and they also serve as a deterrent to vandalism. Keeping the bulb in your garage light fixture completely screwed-in not only helps keep the Manors safe and well-lit, it also assists the Association in identifying photocell switch failures so they can be repaired.
We have already experienced a half-dozen or so photocell switch failures and the only way for the Association to identify them is when bulbs are known to be good and completely screwed into their base. Tonight's inspection and maintenance showed that none of the fixtures were dark because of a photocell switch failure in the "off" state. The photocell switches can also fail in the "on" state and they are easier to detect because they no longer turn the current on and off at the right time. If you notice that your exterior garage light is burning during the daytime, please contact me and I will arrange to have the photocell switch replaced.
UPDATE - why not install compact fluorescent (CFL) instead of incandescent light bulbs?The Association is installing long-life (2,000 hours), 40 watt incandescent bulbs that cost 60 cents each and which put out 455 lumens of light. Using the DTE residential billing rate from my last bill, I calculate that it costs me $2.12 per year to keep a 40 watt bulb light burning for the 12 month average of 12 hours per night. For $1.80 I can purchase a compact fluorescent light (CFL) bulb that is rated at 8,000 hours life, 13 watts and 450 lumens. The CFL will use only one-third the energy of that 40 watt incandescent bulb, which means that a CFL will save me about $1.40 per year in electricity costs. Since it will last longer than the incandescent bulb, I also need to compare the bulb purchase and replacement costs to estimate the total savings.
If the CFL actually lasts for the 8,000 hours rated life, then over a two-year period we would use (1) CFL versus (4) incandescent bulbs. At $1.80 versus ($0.60 x 4 = $2.40), the CFL purchase savings over two years is about $0.60. When you add that to the $2.80 savings in electricity over two years, I estimate that using a CFL bulb will at most save a grand total of $3.40, or $1.70 per year.
However, based on what I'm seeing here in the Manors, I don't believe that the CFL bulbs in the exterior garage lights are lasting anywhere near the rated 8,000 hours (about two years) because of having to operate in the cold temperatures during the winter. If I assume that they last only 4,000 hours (about one year), the grand total savings over two years is only about $1.60, or 80 cents per year (because the CFL bulb replacement costs are now higher, the savings is all in electricity usage).
Therefore, based on my analysis I believe that:
a) the Association's bulb replacement costs over a two year period is about the same or even slightly lower if we use 40 watt incandescent bulbs instead of 13 watt CFL bulbs
b) the co-owner's cost for the additional electricity to burn a 40 watt bulb over that two-year period is at most $2.80
c) until either the CFL purchase cost comes down and/or their outdoor life expectancy improves, the Association will purchase 40 watt incandescent bulbs for the exterior garage light fixtures.
