As you have already read, H7 bulbs emit light in the range of 2500-4000 lumens, while H11 bulbs emit around 1250 lumens. So, if we compare brightness, then H7 bulbs are definitely brighter. So, in case you need a brighter option for your car, choose H7. The answer is simple. You need to look at the back of one of your headlights (though this is easier said than done sometimes). Note the orientation of the alignment tab for the stock halogen bulb. If it's at the top (12 o'clock position), order an H7A. If it's at the bottom (6 o'clock), order an H7B. If the alignment tab is off to one side Halogen bulbs use a tungsten filament, similar to that in a household bulb, but are filled with halogen gas, which helps the filament glow brighter and last longer. The H4 is a double-filament Although xenon HIDs are the best option for those seeking the whitest headlight bulbs, there are plenty of white H7 bulbs options too. If you want halogen headlight bulbs that are a close colour match to factory-fitted xenon HIDs, you should choose Philips Diamond Vision. This range has a colour temperature of up to 5000K, giving you a bright Hi, I'm no pro mechanic but assuming that you have a vectra B, i have had to replace the headlight bulbs on mine and i believe that you require; 1x pair of H7 bulbs (Dipped beam) 1x pair of 501 bulbs (Sidelights) 1x pair of H1 bulbs (main beam) NB: Not all vectras take the H1 bulbs, mine does not anyway so i have 4x H7 bulbs, but of course i Reviews from Other Drivers. The Philips X-treme Vision Halogen Headlight Bulbs have clearly struck a chord with drivers. Over 22,000 reviews gave 4.3/5 overall rating, speak volumes about their popularity. Many glowing reviews highlight noticeable differences in brightness, length, and width of the beams. The Philips Racing Vision RacingVision +150% H7 Headlight Bulbs (Twin) 12972RVS2 is our top choice among the best H7 bulbs, because: These bulbs are 150% brighter on the road. They exhibit high-performance power even in challenging conditions and poor roads. These bulbs offer optimal visibility while riding. The primary difference between the H1 and H4 bulbs is the number of filaments in each bulb. The H1 bulb is a halogen bulb, which contains a single filament that uses 55 watts at 12 volts. The H4 bulb is a dual-filament halogen bulb that uses 60 or 55 watts at 12 volts, depending on which filament is in use. Xenon bulbs can produce a brighter, whiter light than a halogen car, and tend to have a longer lifespan. HID stands for High-Intensity Discharge. The bulb works in a different way to a halogen. Instead of a filament heating up and glowing, HID headlights use electrodes to charge the gas inside the bulb. Also recommended by Auto Express for 2023 is Ring’s Xenon200 H7 headlight bulbs. Offering up to 200% brightness, this sees the brightest performance upgrade for the brand, performing well in testing and maximum brightness assessments, with a wide, bright projection and clear cut-offs. With a 3,700 Kelvin colour temperature, these bulbs aJ2Hc.