How to Prevent Alabaster Sconces from Getting Discolored
Lighting guru Randall Whitehead explains why alabaster sconces offer get discolored over time and what to do about it.
We have 20-year-old genuine alabaster sconces that have a discolored spot on the outside of the alabaster ‘lenses’. Can this be safely removed? We used a soft sanding sponge, and a lot of the stain came out, but I’m worried about the long-term effects of sanding. I’m not sure if the spot is caused by the missing heat shields, which would have protected the insides of the sconces from the 60W lamps, or something else. The discoloration is not nearly as noticeable on the inside of the lenses. Thanks.
Thank you for your question about the alabaster. This situation occurs quite often. What usually happens is people put in higher-wattage bulbs than what is recommended for the fixtures, and the alabaster closest to the bulbs gets “cooked.” In your case, the heat shield was removed or lost, and the unshielded heat from the 60W bulb caused the discoloration. You were able to get a lot of the discoloration out by using a soft sanding sponge, but until the wattage is reduced or the heat shield is replaced, the dark spot will, in time, return. According to alabaster expert John Haddad of JH Lighting, the heat of the bulb has taken the moisture out of the stone, and that can’t be replaced after the damage has been done. To compound the issue, a sealant is normally applied to alabaster when a fixture is new, and you removed some of this sealant when you sanded the dark spot. This unprotected area will attract dirt over time and cause further discoloration. The dirt and dust in the air attaches itself to the exterior of the lens, which is probably why the dark area appears more on the outside, as opposed to the inside. If at this point you have gotten enough of the discoloration out to live with the fixtures as they are, my suggestion is to use a dimmable screw-in CFL to reduce the heat. Good CFLs are manufactured by Maxlite and Earthtronics, among others. You can also consider replacing the alabaster, which is the more costly alternative. More and more manufacturers of alabaster fixtures, like JH lighting and The Basic Source, are using the new GU24 technology to offer much of their line with CFLs that provide more light for less wattage and reduced heat output as compared with incandescent. Maxlite even offers a screw-in socket, called the MLGSM, that instantly and permanently changes an incandescent fixture into a GU24 fluorescent fixture without rewiring. How great is that?
Randall Whitehead, IALD
Lastest from ask randall
You do have some pretty high ceilings there. I think you should consider using a fixture with a higher lumen output, something in the 800 lumen range... read full story
I think having good lighting at a full-length mirror is very important. The optimum distance between the two sconces should be 3 feet. You do not... read full story
Wow, my mom’s side of the family is from Alberta, Canada, and they needed to do the very same thing! I believe I have an excellent and economical... read full story
Sponsored by Access Lighting, GM Lighting and Nora Lightiing. Date: Thursday, April 24, 2014, 2 p.m. ET Register for free here Webinar Overview:Learning units:AIA/CES LU (... read full story
Sponsored by Access Lighting, Antares, Kichler and Light + Building. Originally Live: Thursday, Oct. 10, 2013Recorded webinar now available for viewing on demand.Webinar... read full story
Sponsored by Access Lighting, Kichler Lighting, Kimberly LED Lighting, Auroralight and Antares Lighting. The lighting marketplace is changing more rapidly today than at any... read full story