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Trailer Clearance and Side Marker Light w/ Mounting Bracket - Incandescent - Beehive - Amber Lens

Trailer Clearance and Side Marker Light w/ Mounting Bracket - Incandescent - Beehive - Amber Lens

Item # MC21AS
Our Price: $7.16
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Trailer Lights
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Shipping Weight: 0.23 lbs
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2-9/16" Diameter x 2-5/16" tall beehive. Incandescent trailer light serves as a clearance and side marker light when properly mounted. Surface mounts with steel mounting bracket - hardware included. 1-Wire design. PC rated. Great Prices for the best trailer lights from Optronics. Trailer Clearance and Side Marker Light w/ Mounting Bracket - Incandescent - Beehive - Amber Lens part number MC21AS can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (44)
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  • Why etrailer?

Optronics Trailer Lights - MC21AS

  • Clearance Lights
  • Beehive
  • Incandescent Light
  • Amber
  • 2-1/2 Inch Diameter
  • Surface Mount
  • Rear Clearance
  • Side Marker
  • Non-Submersible Lights
  • Optronics

2-9/16" Diameter x 2-5/16" tall beehive. Incandescent trailer light serves as a clearance and side marker light when properly mounted. Surface mounts with steel mounting bracket - hardware included. 1-Wire design. PC rated.


  • Incandescent trailer light serves as a clearance and side marker when properly mounted
  • Incandescent bulb can be easily replaced
  • Durable steel mounting bracket
  • Snap-on amber lens over incandescent bulb
  • Surface mount to trailer with mounting bracket - hardware included
  • Single wire design grounds through mounting hardware
  • DOT compliant
  • PC rated


  • Overall dimensions: 4-1/16" long x 2-9/16" diameter
    • Light dimensions: 2-9/16" diameter x 2-5/16" long
  • Distance between mounting holes (center on center): 3/4"
  • Bulb type: incandescent
  • Power draw at 12.8V: 0.4 amps
  • 3-Year warranty

Optronics MC21 Series Marker Clearance Light Dimensions

PC-Rated Lights

Diagram of light spread for PC rated light

A PC-rated light produces a 90-degree angle of light to either side of its centerline for a total of 180 degrees of coverage. This beam pattern can be clearly seen when you are standing directly in front of the light, as well as when you are standing on either side of the light. When properly installed, this type of light can function as both a front clearance light and a side marker light or as a rear clearance light and side marker light.

MC21AS Optronics Trailer Clearance and Side Marker Light w/ Mounting Bracket - Incandescent - Beehive - Amber Lens - PC Rated

Alternate part number: MC-21AS

California residents: click here

Customer Reviews

Trailer Clearance and Side Marker Light w/ Mounting Bracket - Incandescent - Beehive - Amber Lens - MC21AS

Average Customer Rating:  4.9 out of 5 stars   (44 Customer Reviews)

2-9/16" Diameter x 2-5/16" tall beehive. Incandescent trailer light serves as a clearance and side marker light when properly mounted. Surface mounts with steel mounting bracket - hardware included. 1-Wire design. PC rated.


Pic enclosed. Used as behind the grill turn signals for custom MG.

sounds and looks dangerous, since they cant be seen very well but I agree, cool looking they are.
-- comment by: - 07/25/2014


Easy to wire and easy to install. Has held up great (1yr so far). I did however lose a lense within the 1st week and was unable to just buy a new lense. I had the light angles too far down and the vibrations caused the lense to strike the frame I think. Repurchased just to use the lens and bent the angle bracket more upward from the frame. No further issues. 1 star deduction just because there aren't replacement lenses available


Great company. Fast delivery. Using these lights as signal lights to make my Commander road legal. They work great. Will buy from again. Highly recommend.


We have my beloved Father-In-Laws 1965 Ford truck. We wanted to update some of the lighting to make it look like a smilely face goind down the road. These lights worked great. Easy to install and just the right look. Thanks etrailer.


This is more a review of e-trailer than this particular product. I was looking for some amber/orange bezels to fit over existing white LEDs on my motorcycle etrailer site was easy to search, price was reasonable and being in the StL area, delivery was quick. I've used them several times in the past and always good.

These worked great for what I needed. Not being sealed units worked for me since I wanted just the beehive lens which was surprisingly hard to find. They have spent a year down low on the bike taking bugs and all manner of road debris with no problems.
Bob L - 01/26/2018


I had previsly installed signal lights on my Arctic Cat Prowler UTV using the only red and amber beehive lights I could find. They were the new style sealed units which were very dim. I searched the internet over the last few years looking for the old style with the spring wire that holds the lens and a changeable bulb.Then I came across eTrailer and there they were. I called and what I saw was confirmed so I ordered 2 red and 2 amber.2 days later they were delivered.Great service,thank you! Robert MacRae


They're going to look great on this bea uty.


Was in need of an older trailer light and was not available in our local stores. Thanks to etrailer, I found this product which is perfect. Product was packed nicely and in perfect condition when it arrived, on time I might add! Thanks for coming to our rescue!


Fast shipping. Easy to install. Nice and bright, very visible. Cost was extremely good. Professional looking, like they were installed at the factory.
Very pleased with item and will order more products from etrailer as needed.


Item was fair priced & shipped quick. Appears to be better price and better quality than another common brand and I like that the bracket is painted.


They are the best replacement lights that I have found ,work great and look good too.


Just wat I wanted. Couldn't find anywhere else. Fair price and arrived on time in good condition.


Tks for stocking. Just the replacement that I needed. Purchase was easy. Shipping time was good..PO service slow, not your problem—PMG!


Product arrived quickly and as described.
these lights to add turn signals to a Model T Ford.


great little light-used them on my golf cart for directional signals


Easy install. Simple to replace bulbs. Water accumulates in bulb compartment. Drilled small hole in base to fix.


Good replacement. No issues after 1 year. I expect to not have to replace these again.


Well built marker light .. arrived on time ... I chose the wrong light ... my bad.


Easy transaction, quick delivery, great communication. Would definitely do business with you again. Thanks




amber running lights work great
David - 03/24/2022


I recieved These lights in a fast and orderly manner.These lights are very durable and I can't wait to install them. I will post a picture at a later date.Thank you very much for your product.


looked every where for these lights-- you hadem. most didn't-- thank you=- prompt ship-- arrived safe--


Items shipped in a timely manner and packaged well. Will be a repeat customer for sure.


Great product, great service in a timely manner. Noah was a big help.

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

  • Can LED-type Round Beehive Clearance Lights Fit in Place of Incandescent Type
    The Optronics Beehive Side Marker and Clearance Light # MC21AS that you referenced uses a single-wire electrical connection since it grounds through its mounting bracket. The two LED-type round amber beehive lights we offer, which can be seen on the linked page, use a 2-wire hookup and also are flush-mount types that use a rubber grommet for installation. These cannot be installed in the bracket-mount fixture that holds the lens with a metal ring. LED lights are offered in flush-mount...
    view full answer...
  • What Type of Bulb Does the Beehive Side Marker # MC21AS Have In It
    The type of bulb that is in the Beehive Side Marker # MC21AS is an A-67 bulb. We don't carry that style of bulb.
    view full answer...
  • Tail Lights with Separate Amber Turn Signals for a Motorcycle Trailer
    We have lights that can have separate brake light/turn signal functions but they are large double and triple tail lights designed for RVs and would probably not be the best option for a motorcycle trailer. One possible solution is to use a set of regular tail lights such as # TL29BK, and then separate amber turn signals that are DOT approved as turn signals (the amber lights we have are DOT approved as trailer side marker or clearance lights). Although a beehive style light such as #...
    view full answer...
  • Red Beehive Marker Light
    Yes, we do have 2 1/2" beehive lights in red. They are the LED Trailer Clearance or Side Marker Light - Submersible - 8 Diodes - Beehive - Red Lens item # MCL23RB.
    view full answer...
  • Availability of Red-Lens Beehive Side Marker and Clearance Light
    We do offer a red-lens Beehive LED Trailer Clearance/Side Marker Light from Optronics, their part # MCL21RB. This high-efficiency LED light features 8 diodes and can be mounted using Round Grommet # A54GB and connected using Two Wire Pigtail # A46PB. We do not have the exact bracket mount light you referenced in a red version. The link at right will show you all round, red surface-mount clearance lights.
    view full answer...
  • Red Beehive Marker And Clearance Light In 2-1/2 Inch Round
    The Beehive Side Marker and Clearance Light w/ Mounting Bracket, 1 Wire - Amber # MC21AS is the only light that comes with the bracket. If you want a red light in the same size, we have the Sealed LED, Beehive Trailer Clearance, Side Marker Light, 2-1/2" Diameter - Red # MCL23RB that can be flush mounted using # A55GB or recess mounted using # A57GB. If you want a recessed mount, you can use the Heavy-Duty Metal Mounting Bracket for 2-1/2" Round Clearance Lights # BK55BB for these lights...
    view full answer...

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Info for this part was:

Employee Sarah L
Expert Research:
Sarah L
Employee Tyler C
Written by:
Tyler C
Employee Cole B
Installed by:
Cole B
Employee Brian T
Updated by:
Brian T
Employee Noah M
Updated by:
Noah M

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