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1157 Incandescent Bulbs - Double Contact Bayonet - 8 Watt - Soft White - Qty 2

1157 Incandescent Bulbs - Double Contact Bayonet - 8 Watt - Soft White - Qty 2

Item # DI79VR
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Incandescent light bulbs replace 1156 (S25) bulbs to provide 404 lumens of soft white light for automotive and RV applications. BAY15d base. Lowest Prices for the best tail lights from Diamond. 1157 Incandescent Bulbs - Double Contact Bayonet - 8 Watt - Soft White - Qty 2 part number DI79VR can be ordered online at or call 800-298-1624 for expert service.
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  • Reviews (3)
  • Q & A (0)
  • Videos (1)
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  • Why etrailer?

Diamond Tail Lights - DI79VR

  • Brake Light
  • Turn Signal
  • Replacement Bulbs
  • White
  • Diamond
  • Incandescent Light
  • Pair of Bulbs

Incandescent light bulbs replace 1156 (S25) bulbs to provide 404 lumens of soft white light for automotive and RV applications. BAY15d base.


  • Incandescent bulbs replace 1157 (S25) light bulbs to provide soft white lighting
    • Great for hanging, side mount, and some overhead applications
  • 12-Volt bulb has many applications for RVs, trailers, boats, and vehicles
    • Operates at up to 14V - ideal for automotive applications
  • Soft white color temperature produces a yellowish, white light
  • Double contact bayonet base installs into compatible 15-mm socket with a push-screw motion


  • Quantity: 2 bulbs
  • Light output: 404 raw lumens
  • Bulb size: 1" diameter
  • Bulb type: 1157
  • Bulb shape: S25
  • Base type: BAY15d
  • Light type: soft white
  • Color temperature: 2,700 K
  • Wattage: 8.3 watts
  • Candela: 32.14
  • Power draw at 12V: 0.94 amps
  • Input voltage: 12V - 14V
  • 1-Year limited warranty

DG71215VP Diamond Group Replacement 1157 Incandescent S25 Bulbs - BAY15d - 8 Watt - Warm White - 12V/14V - 2 Pack

Video of 1157 Incandescent Bulbs - Double Contact Bayonet - 8 Watt - Soft White - Qty 2

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

Video Transcript for Review of Diamond Vehicle Lights - Replacement Bulbs - DI79VR

Jeff: Hello everybody, this is Jeff at Today we're going to take a look at the 1157 12-volt incandescent bulbs. It's a dual-contact bayonet base, soft white color for a quantity of two bulbs.Now, these are a standard 1157 incandescent bulb. It is a dual-filament bulb that replaces a dual-filament burnt-out bulb, and it is a 12-volt bulb; fits many applications such as brake or turn signals on your RV. It has a clear bulb, provides a nice soft white light, and this part does include two bulbs.A few specs on this, the lumens for the low filament is 38 lumens, for the high filament it's 402 lumens. The bulb type is 1157.

The size of the bulb or the diameter of it at the widest part is one inch, and the base this uses is a BAY15D, which is a dual-contact bayonet base.I am going to hook this up to some 12-volt power just to show you the low element and the high element. So what we're going to do is take our power, and you can see it's a dual-contact, so one of them will be the high and one of them will be the low.We'll go ahead and do that one first. And if we take our ground. There we go. And there'll be your low element, or low filament.

Go ahead and turn off the overhead lights. You can see that'll give you the low. And then if we turn it around to the other, you'll be able to see there's your brighter, high filament.We're going to turn back on our overhead light. But that should do it for the review on the 1157 12-volt incandescent bulb, the dual-contact bayonet base, soft white color, for a quantity of two bulbs.

Customer Reviews

1157 Incandescent Bulbs - Double Contact Bayonet - 8 Watt - Soft White - Qty 2 - DI79VR

Average Customer Rating:  5.0 out of 5 stars   (3 Customer Reviews)

Incandescent light bulbs replace 1156 (S25) bulbs to provide 404 lumens of soft white light for automotive and RV applications. BAY15d base.

- DI79VR

- DI79VR

- DI79VR


Ask the Experts about this Diamond Tail Lights

  • How to Replace Bulb in Wesbar 403075 Trailer Taillight
    I've put in a request to have the video reshot, but in the meantime changing the bulb is very easy. Simply remove the Phillips screw from the underside of the lamp assembly. Once the screw is removed, you can gently pry the clear plastic cover off which will provide access to the bulb (see the provided photo). Push in on the bulb and give it a twist, then pull it free. The replacement bulb is an 1157 which we sell as part # DI79VR.
    view full answer...
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  • Can The Bulb In A Peterson 421KRUS Tail Light Be Replaced
    The Peterson Trailer Tail Light # 421KRUS is a sealed waterproof unit, but the bulb will technically replaceable. However, removing the cover to gain access to the bulb will damage this seal and the light will no longer be waterproof, so I do advise replacing the entire light if the bulb has gone out. If you do choose to just replace the bulb and break the waterproof seal, I spoke to Peterson and the bulb that fits this light will be the 1157 style bulbs, like the Diamond # DI79VR.
    view full answer...
  • Troubleshooting Pop Up Camper Trailer Left Signal/Brake Light Not Working
    The first place I always check is with the bulbs. The 1157 Incandescent Bulbs # DI79VR are easily damaged internally and not always visible. If you do not have a known good spare you can simply swap it with the passenger side bulb since you know that works properly. This will allow you to eliminate the chance of the bulb being bad. If the bulb is know to work then I recommend checking with any fuses that you may have on your vehicle. If your tow vehicle came from the factory with the...
    view full answer...
  • How to Replace Bulbs in ST47RB Optronics Incandescent Trailer Stop/Turn/Taillight
    The housing of the Optronics # ST47RB lamp is held together by two screws that are accessed from the rear of the lamp housing. Once the screws are removed, the lens can be removed from the housing and the 1157 bulb, part # DI79VR can be replaced. An LED version is available as part # M824R. The LED lamp uses less power, will be much brighter and will last up to 50 times longer than a comparable incandescent lamp.
    view full answer...
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  • Replacement Bulbs for Optronics # ST16RB Taillight
    The Trailer Light Kit you referred to uses an # ST16RB and a # ST17RB taillight, which use a 1157 replacement bulb which we offer as part # DI79VR .
    view full answer...

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Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee Daron K
Edited by:
Daron K
Employee Brian T
Written by:
Brian T
Employee Noah M
Updated by:
Noah M

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