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Light Guide LED Backup Light w/ Tail Light - Submersible - 12 Diodes - Round - Clear Lens

Light Guide LED Backup Light w/ Tail Light - Submersible - 12 Diodes - Round - Clear Lens

Item # BUL603CRB
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Our Price: $24.34
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Optronics Tail Lights - BUL603CRB
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In Use/Installed

4" Round. Waterproof trailer light serves 2 functions: tail light and certified backup light - when used in a pair. Smooth red X-shape crosses the light face for tail function. Recessed mount with grommet (sold separately). Accepts 3-prong plug. Lowest Prices for the best trailer lights from Optronics. Light Guide LED Backup Light w/ Tail Light - Submersible - 12 Diodes - Round - Clear Lens part number BUL603CRB can be ordered online at etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Q & A (2)
  • Videos (2)
  • Photos
  • Why etrailer?

Optronics Trailer Lights - BUL603CRB

  • Tail Lights
  • Round
  • LED Light
  • Red and White
  • Recessed Mount
  • 4 Inch Diameter
  • Submersible Lights
  • Optronics
  • Stop/Tail/Backup

4" Round. Waterproof trailer light serves 2 functions: tail light and certified backup light - when used in a pair. Smooth red X-shape crosses the light face for tail function. Recessed mount with grommet (sold separately). Accepts 3-prong plug.


  • Round LED backup light for trailers and utility trucks with auxiliary tail function
    • Certified for backup light function in a 2-lamp system when a pair of lights are installed (second light sold separately)
  • Light Guide Series features a smooth X-shape across the face of the light
  • Sonically sealed, waterproof housing and lens unit is submersible
  • Durable surface-mount technology (SMT) construction of LED circuit board
    • Better withstands shock and vibration
    • Allows for improved heat distribution
  • LEDs make great replacements for incandescent lights
    • Last 50 times longer
    • More efficient - provide brighter light with less power output
    • No bulbs to replace - no brittle filaments
  • Durable polycarbonate lens and housing
  • White and red LEDs with clear lens
  • Compatible with 12V DC systems
  • Recessed mount with grommet (A45GB - sold separately)
  • Accepts industry standard 3-prong plug
  • DOT compliant
    • Meets FMVSS 108 requirements in any 360-degree position


  • Dimensions: 4-5/16" diameter x 1-11/16" deep
  • Number of diodes: 12
  • Power draw 12.8V: 0.216 amps
  • Lifetime warranty on LEDs

Optronics BUL603CRB Light Guide LED Backup 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.

PL-3 Wiring Connection

Optronics PL-3 Connection

This Light Guide light has a standard 3-prong plug as pictured above. A 3-prong pigtail (A45PB or A47PB - sold separately) is required to connect this light to your vehicle or trailer. You will also need a rubber grommet (A45GB - sold separately) to install your tail light.

Recessed-Mount Light

Recessed mount light

Recessed-mount trailer lights install underneath a housing or a grommet, which is often sold separately. These lights will extend into the mounting surface and require that a hole be cut into your trailer.

BUL603CRB Optronics Light Guide LED Backup Light for Truck or Trailer - Backup and Tail Function - Submersible - 12 Diodes - Round - Clear Lens

California residents: click here

Video of Light Guide LED Backup Light w/ Tail Light - Submersible - 12 Diodes - Round - Clear Lens

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

Video Transcript for Optronics Light Guide LED Truck/Trailer Light Review and Installation

Today we're gonna be taking a look at, and showing you how to install, the Light Guide LED Truck and Trailer Light.Now what sets this light apart from many of the others is not only is it a super bright reverse light, you also have the added safety of a running light. Now these lights are LEDs, which are much more reliable than your traditional incandescent style bulb. Overall, they're gonna use less power and be brighter.Now here's the measurements to see if it'll work for your needs. The light itself is four and 5/16 of an inch round. The thickness of the light, without the plug, is an inch and 1/16 thick. If you add the plug on there, the thickness is gonna go up to one inch and 11/16.All right, here on the back of the light we have our connection points.

They do come covered in dielectric grease so you won't have to worry about that during your install. Above and below each connection point, there's actually some fine print that tells you what that connection point is going to be used for.Another thing I really like about this light is how it utilizes a clear lens. In my opinion, when it's not in use it just offers a little more of a clean look.All right. The light's going to have 12 diodes total. As far as the power draw goes, at 12.8 volts, it's going to draw only .216 amps.

That should leave you with plenty of power to run anything else you might have.The light is sonically sealed, which does mean it is submersible. However we recommend not having the power on and only doing it for the shortest possible time if you need to get it wet.Now these lights are DOT compliant. Overall they're going to be a great replacement for an incandescent lamp.I'm gonna show you how easy it is to get these lights installed. Now they are designed to be used with a rubber grommet. Since we're replacing ours, we're just gonna go ahead and put in a new grommet while we're doing that.

If you need a new one, or a replacement, you can find one on eTrailer.com. I'm gonna show you just how easy it is to get installed.We'll take our connector and run it through our opening. Gonna plug it in. Now we can push the light into the grommet. Sometimes it's really gonna be a tight fit so it does help to get some silicon spray lubricant, or just some soapy water even, and spray the grommet.

That'll help that light just slide in easier.We went ahead and put some power to our light. As you can see it works. This is the running light. Now go ahead and use the reverse light function.If you purchase more than one of these lights, you just repeat the same process to get the others installed.That'll do it for our look at and installation of the Light Guide LED Truck and Trailer Light with a Clear Lens.


Ask the Experts about this Optronics Trailer Lights

  • Round LED Trailer Taillight Recommendation Can Be Used as Turn Signal and Stoplight
    The two light illuminations of the light part # BUL603CRB are for a lower intensity red X and a bright white. It's really ideal as a taillight and reverse light. For a similar light that's designed for stop/turn and running light we have the GloLight kit part # STL190RB.
    view full answer...
  • Ways to Convert Trailer to LED Type Lighting
    You can convert your RV to separate turn signals and/or LED operation in a couple of ways, depending on how much wiring modification you care to do. Any of your existing lights can be converted to LED operation by swapping out the incandescent bulbs for LED-type replacement elements. We have LED equivalents that are drop-in replacements for many popular standard bulbs. All appear on the linked page and can be selected by bulb number, such as the popular 194 type bulb # A194B that can...
    view full answer...

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Info for this part was:

Expert Research:
Jameson C
Video by:
Joshua S
Video Edited:
Jacob T
Installed by:
Cole B
Installed by:
Ryan G
Edited by:
Daron K
Written by:
Brian T

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