Can anyone confirm if they pass MOT?

No guarantee they will on your car but mine did on a '54 X-Trail. They produced a good flat line across the top which wasn't too high which is what they look for. Check out some vids on Youtube and adjust your lights before the MoT if you need to. The difference these make to night driving is staggering and well worth the effort.

Is there a way to fit these upside down or is it foolproof? Should the notch in the bulb bit be at top or bottom

The is only one way they will fit in fool proof

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Philips Ultinon Pro9100 LED car headlight bulb (H4), +350%, 5.800K, set of 2

Philips Ultinon Pro9100 LED car headlight bulb (H4), +350%, 5.800K, set of 2

Product ID: 488448085

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Details

Brand
Philips
Specific uses for product
Head light
Brightness
350.0 lumen
Wattage
18 watts
Item package quantity
1

⏳Up to 5,000 hours lifespan

💡+350% brightness boost

❄️5,800K crisp cool white light

Description

🚗 Brighten your drive, own the night!

COOL WHITE CLARITY - 5,800K color temperature delivers sharp, modern cool white beams that cut through darkness.
PLUG PLAY UPGRADE - Compact all-in-one design ensures effortless installation—no mechanic needed.
DRIVE WITH CONFIDENCE - Designed by Lumileds, trusted by professionals, for superior front lighting performance.
ILLUMINATE LIKE A PRO - Experience up to 350% brighter light for unmatched night visibility.
LONG LASTING PERFORMANCE - Engineered to shine for up to 5,000 hours, reducing replacements and hassle.

The Philips Ultinon Pro9100 H4 LED car headlight bulbs deliver a powerful +350% brightness increase with a crisp 5,800K cool white light. Built for longevity, these bulbs last up to 5,000 hours and feature a compact plug-and-play design for easy installation. Perfect for professionals and enthusiasts seeking enhanced night driving visibility and style.

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Fantastic and great service. Shipping was faster than expected.

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4159 DH

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Manufacturer	Lumileds
Brand	Philips
Model	Ultinon Pro9100
Package Dimensions	21.7 x 19.1 x 8.1 cm; 440 g
Item model number	1866394
Manufacturer part number	11342U91X2
Position	Front
Voltage	12 Volts
Wattage	18 watts
Item Weight	440 g

Philips Ultinon Pro9100 LED car headlight bulb (H4), +350%, 5.800K, set of 2

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