4257 HP24 LED Bulb Cool White Switchback Pair Diode Dynamics

Upgrade. Add dual-color functionality and a modern appearance to your front turn signals with the 4257 HP24 turn signal bulb. Populated with sixteen amber chips and eight white chips, this bulb lights up white when your headlights are turned on, and flashes amber when the turn signals are activated. Housed in an aluminum casing for maximum heatsinking properties, the HP24 will last for years to come. Best of all, installation only takes minutes - simply take out your factory bulb and the HP24 will fit snugly in the socket.

The 4257 HP24 Switchback bulb features a custom-molded base connector, making it a true replacement for factory incandescent 4257-size front turn signal bulbs. Unlike a 3157 bulb that includes tabs on either side of the bulb, a 4257 bulb does not. The 4257 HP24 Switchback bulb is compatible with Ford vehicles using a dual-filament 4257-size front turn signal bulb with a clear reflector lens.

Switchback. Some Ford vehicles use a dual filament 4257-size front turn signal bulb, which allows you to add switchback functionality to your turn signal location. From the factory, the front turn signal lights up half-power amber when the headlights are on, and flashes full-power amber when the turn signal is activated.

By using this dual-filament design, along with the embedded digital timing circuit, you can upgrade this look: the HP24 lights up in a 6000K cool white color when your headlights are turned on, and flashes amber when the turn signal is activated. When you switch the turn signal off, it switches back to white. This allows you to upgrade your front end to an all cool white appearance, while still keeping your turn signal functionality. The HP24 bulb is only suitable for vehicles that have a clear front turn signal reflector lens.

Brightness. At 410 lumens, the HP24 will provide about double the total light output compared to your factory bulb. All Diode Dynamics LED lighting is rated with accurate, measured lumen figures, not calculations or guesses. We test the true output in-house, and provide you the real numbers to compare.

Reliability. Unlike other bulbs on the market, this bulb is built with constant-current circuitry, along with transient suppression. That means this bulb will last for years, not months, with no flickering or failure. And like every Diode Dynamics product, it's backed by an industry-leading three-year replacement warranty.

Experience. After over a decade in business, Diode Dynamics is the most trusted name in automotive LED lighting. Unlike every other LED distributor, we assemble and engineer products ourselves in the United States, for high quality and fast time-to-market of the newest and brightest LED technologies. We pride ourselves in offering only quality LED products, that will exceed your expectations.
Features:

• True replacement for factory incandescent 4257-size front turn signal bulb.
• Custom-molded base connector for correct fitment.
• Adds cool white running light, along with amber turn signal.
• High-power Samsung LEDs arranged around the bulb.
• No yellow appearance when switched off.
• Non-polar and CK compatible.
• Plug and play, simple installation.
• Cool White
• Pair
• Fitment: The 4257 HP24 Switchback bulb is compatible with Ford vehicles using a dual-filament 4257-size front turn signal bulb with a clear reflector lens. Unlike a 3157 bulb that includes tabs on either side of the bulb, a 4257 bulb does not.

What is your shipping cutoff time? 

Cutoff time is 1pm EST. Assuming we have all your parts in stock, the order should ship the same day. If you need a product by a specific date, please call us to find out if its possible to meet your deadline before ordering. Please be aware that there may be discrepancies with shipping calculators or “in stock” status of a product. 

Will I receive a tracking number? 

Of course! As soon as your order is shipped you will receive a tracking notification through email. You can also always log into your account and check the tracking information on the order. 

Is shipping free? 

Orders over $99 qualify for free shipping within the contiguous  United States. *Services are excluded from free shipping. We will chose the most economic method. If you need a product as quickly as possible, always best to chose an expedited shipping option. 

Return Window

We allow up to 90 days from the original purchase date to return your item for an exchange or store credit. If you wish to return the product for a refund, we allow up to 45 days from the original purchase date. 

Shipping 

Customers are responsible for return shipping costs, unless of course we made an error when we shipped out the order. Please contact us if an error was made, we can send over a return label to the email address on file to begin the exchange process. 

Refunds/Store Credit

Please be advised that any free shipping promotions used on the original order will be forfeited if the order is returned and the original shipping costs (paid or unpaid) will also be deducted from the refundable amount.  Refunds can only be processed to the original payment method. Store credit will be sent through an email gift card, which you can apply to your next order with us. 

Our standard restocking fee structure is outlined below. Please refer to our exchange and refund policies for important timelines. 

Tier 1: Perfect condition. (Unopened & like-new) = 90% refund or 100% store credit.
Tier 2: Re-conditionable. (Packaging opened or damaged) = 80% refund or 90% store credit.        
Tier 3: Inability to restock. (Product & packaging both damaged) = 70% refund or 80% store credit. 

Exclusions

If the part has been installed, and shows signs of use, we are unable to take the product back for an exchange or refund. Original Osram and Philips bulbs cannot be returned if the authenticity seal has been broken. Any special ordered item, such as a custom headlight conversion, is not eligible to be returned. 

HID and LED bulbs are street legal in the USA for Fog Light use only. Not compliant with DOT / FMVSS108 and not street legal in the USA for Headlights. Legal for off-road use in Snowmobile and ATV headlights and off-road racing use only auxiliary or forward lighting. International street legality varies by country. 

Note: This usage regulation is not unique to products found on our website. All LED and HID bulbs from all other brands, regardless of marketing claims, are prohibited from street use in halogen headlights in the USA. To find street legal LED headlight assemblies, click HERE.