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Optronics Back Up Light - Submersible - Oval - Clear Lens

Optronics Back Up Light - Submersible - Oval - Clear Lens

Item # BU74CB
Our Price: $14.58
Trailer Lights
Orders above $50 qualify for Free Shipping
Shipping Weight: 0.5 lbs
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6-1/2" x 2-1/4" Oval. Waterproof incandescent trailer light functions as a back-up light. Shock proof socket protects bulb. Recessed mount with included grommet. Industry standard 2-prong plug. Great Prices for the best trailer lights from Optronics. Optronics Back Up Light - Submersible - Oval - Clear Lens part number BU74CB can be ordered online at or call 1-636-306-4830 for expert service.
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  • Reviews (25)
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Optronics Trailer Lights - BU74CB

  • Tail Lights
  • Oval
  • White
  • 6-1/2L x 2W Inch
  • Recessed Mount
  • Backup
  • Submersible Lights
  • Optronics

6-1/2" x 2-1/4" Oval. Waterproof incandescent trailer light functions as a back-up light. Shock proof socket protects bulb. Recessed mount with included grommet. Industry standard 2-prong plug.


  • Oval incandescent trailer light functions as a back-up light
  • Sonically sealed, waterproof housing and lens unit is submersible
  • Incandescent bulb can be easily replaced
  • Shock-proof socket protects bulb from damage
  • Durable polycarbonate lens and housing
  • Clear lens
  • Recessed mount with included grommet
  • Industry standard 2-prong plug


  • Overall dimensions: 7-5/8" long x 3-3/8" tall x 2-3/8" deep
    • Light face dimension: 6-1/2" x 2-1/4"
  • Bulb type: incandescent
  • Power draw at 12.8V: 2.1 amps
  • 3-Year warranty

Optronics BU70 Series Sealed Back Up Light Diagram

Sonically Sealed, Waterproof Trailer Light

The waterproof construction of this light makes it ideal for use on trailers that may be submerged, like a boat trailer. The housing and lens are sonically sealed together to create a single unit, which means that water will not get into the light and damage the diodes or circuit board.

Recessed-Mount Light

Recessed mount light

Recessed-mount trailer lights install underneath the included grommet (A70GB). These lights will extend into the mounting surface and require that a hole be cut into your trailer.

BU74CB Optronics 6-1/2" Oval Trailer Back Up Light - Flush Mount - Sonically Sealed - Clear

California residents: click here

Video of Optronics Back Up Light - Submersible - Oval - Clear Lens

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Optronics Trailer Lights - Tail Lights - BU74CB Review

Speaker 1: Today, we're taking a look at the Optronics Oval Trailer Back-Up Light. This is a clear oblong light that functions as a back-up light for your trailer. It features a sonically sealed waterproof lens and housing. It contains one incandescent heavy duty long life bulb and that bulb sits in a shockproof socket, which guarantees long bulb life. The light housing is an all weather molded plastic housing, which protects the unit from corrosion. It does come with a mounting grommet for a flush mount design and it also comes with your two wire plug.

You white wire is your ground wire. Red wire is your power wire. Now, the trailer light itself, just the actual light measures 6-1/2 inches long by 2-1/4 inches talk, about 2-3/8 inches deep.With the grommet, the overall length is 7-5/8 inches and then the overall width edge to edge or the overall height, depending on how you have it installed is 3-3/8 inches. The hole that's needed for your installation should measure 6-11/16 inches long by 2-5/8 inches wide or tall. We're going to go hook up to power, that way you can see what it looks like with some power running to it.

Then, we'll also turn off our overhead lights so you can see it in a lower light setting. Now again, this is a unit that contains one incandescent bulb. Clear lens allows plenty of light to come through. Has a really nice design to it. Nice consistent light output.

The unit is SAE and Department of Transportation compliant.That's going to do it for today's look at Optronics Oval Trailer Back-Up Light.

Customer Satisfaction Score:

Customer Reviews

Optronics Back Up Light - Submersible - Oval - Clear Lens - BU74CB

Average Customer Rating:  5.0 out of 5 stars   (25 Customer Reviews)

6-1/2" x 2-1/4" Oval. Waterproof incandescent trailer light functions as a back-up light. Shock proof socket protects bulb. Recessed mount with included grommet. Industry standard 2-prong plug.


Great product fit like a glove and very easy to install. Would highly recommend this product to anyone who needs to replace their boat tailer back up lights.


Product received was exactly as ordered and arrived quickly.
Installation couldn't have been easier.


great customer service, and quick deliv ery


Thier a light alot cheaper than anywhere near me


Quick shipping. Good packaging. I've never ordered from this place before, but they are definitely on the list now for trailer parts.

Awesome! I got contacted to do a follow up. Good thing too. I was just thinking of replacing my other lights, and couldnt remember who I ordered from. Placing an order with etrailer today.
Glenn - 03/05/2021


Great fit. 10 minute installation...


etrailer always have the parts I need and is very prompt in processing and shipping. Great folks to do business with.


Just what we ordered, came fast.

Great still working
Tim - 09/24/2021


Used on interior door of VPG mobility van. Has worked fine.


Product was exactly as described. Had all parts with the light. Worked perfect. Delivery was fast and on time.


Another great eTrailer product. Fit per fectly.


The lights fit right into the master craft trailer. Nice fit, and fast shipping.


I’m very happy with etrailer! I got exactly what I order and it came in the mail a day earlier than it was supposed too. I definitely order from them again.


Perfect Size and Fit. Looks great on our Motorhome. Easy to Install.


Lights were as described, package and shipping was good and timely, product was good quality thanks


Great product, just as described! This place is great, they carry pretty much everything. Thanks




Great product got it fast and still wor king



The part fit great. Came quickly. Great service!


good service good product for my 49 hot rod thx.


Good value. Fast shipping. Well pleased. Thanks Steve





See what our Experts say about this Optronics Trailer Lights

  • Oval LED Reverse Lights with Grommet for Flatbed Trailer
    We have exactly what you are looking for in terms of an LED reverse light that fits with a grommet for your flatbed trailer. The Optronics LED Backup Light for Truck or Trailer - 6 Diodes # BUL12CB or the same light with 10 Diodes # BUL10CB can be mounted to your trailer with PVC Grommet for 6-1/2" Oval Trailer Tail Lights # A70GB and you will just need a 2-wire pigtail for the lights. For this you can use 2-Wire Pigtail # A45CB or Right Angle 2-Wire Pigtail # A49PB. I have added links...
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Info for this part was:

Employee Cole B
Installed by:
Cole B
Employee Wilson B
Updated by:
Wilson B
Employee Brian T
Updated by:
Brian T
Employee Noah M
Updated by:
Noah M
Employee Anna W
Written by:
Anna W

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