Model # DFMS15

Internet #100652118

Store SO SKU #1000549819

Lithonia Lighting 15 in. Square Acrylic Diffuser

Lithonia Lighting

15 in. Square Acrylic Diffuser

$2340 /each
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Frequently Bought Together

Product Overview

Stay-white acrylic diffuser provides soft, pleasing illumination for the Low Profile Square fixture. Easy-latch secures diffuser to housing.

  • Diffuser only
  • 15 in. square
  • White
  • Acrylic construction
  • Can be used with the following model number: FMLS12 2 13 FMLS 54 FMLS15 2 18DTT
  • UL Listed to US and Canadian safety standards and suitable for damp locations
  • Hidden cam latches provide for easy diffuser removal for installation and maintenance



Product Depth (in.)
Product Height (in.)
Product Width (in.)


Color Family
Fixture Color/Finish
Clear acrylic
Number in Pack
Product Weight (lb.)

Warranty / Certifications

Certifications and Listings
1-UL Listed
Manufacturer Warranty
1 year

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Customer Questions & Answers

is the 15" dimension the part that clips to the light base or the outside casing.I am trying to replace one 20" square with inside ridge 15" square

which of the below would be correct?
Asked by: Anonymous
it's the outside. The place that goes under clips is a little over 13 inches.
Answered by: Dion
Date published: 2015-09-20
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Customer Reviews

15 in. Square Acrylic Diffuser is rated 3.0 out of 5 by 5.
Rated 5 out of 5 by from nice light! Purchased this light three years ago for my mom's walk in pantry. It is instant on and gives a bright light. One of the two bulbs did burn out after two years, but otherwise it has been a great light which I would recommend.
Date published: 2011-09-11
Rated 2 out of 5 by from Diffuser would not fit 20-year old lamp base. The Home Depot part number given to me by Lithonia Lighting was for a diffuser for the current model 15" inch "Pillow" light, not for the original model purchased in 1994. I returned it to Home Depot for a refund. Sorry, can't send a picture because it could not be installed.
Date published: 2015-03-27
Rated 4 out of 5 by from Correct replacement for Lithonia FM 54 ACLS LP R4 and FM54 ACLS LP M4 I purchased this diffuser to replace the original which broke after it fell from the ceiling & hit the floor. However, the real culprit responsible for it falling & breaking was actually the plastic fasteners that are used to secure the diffuser to the light fixture's base. In short, most plastic objects oxidize over time, especially given ample exposure to light. In this case, the plastic fasteners lasted for about 10 years. But they finally became brittle enough for one to break, and that’s what caused our equally brittle, 10-year-old plastic diffuser to come crashing to the floor. So in addition to hunting down this diffuser, I also needed to contact Lithonia (@ 770-922-9000) to see if the fixture’s fasteners were available. And to my utter amazement, this company seems genuinely committed to providing good product support--because they’re sending me 2 new fasteners free of charge, which is great. Anyway, if you’re shopping for a new diffuser, maybe you could use a couple of new fasteners too? God bless! (:
Date published: 2016-07-27
Rated 3 out of 5 by from quick fix purchase This was purchased because the heat from the fixture made the original diffuser brittle and start to fall apart. It went on easily and looks like new. Just hope it lasts longer than original. These should be made tougher in the first place.
Date published: 2014-12-30
Rated 1 out of 5 by from Returned item Did not like the appearance of this item, would not recommend purchase.
Date published: 2011-12-14
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