These LED H4 Bulbs use high CRI (Colour Resonage Imaging), only ever used previously in high-end retail lighting to make it easier to visually distinguish between different shades of the same colour and between similar but different colours, like dark green and dark blue. This reduces the stress of night driving and helps to avoid driver fatique.
They come with a 5 year warranty.
These lights have been evolved to give a good beam pattern in any headlight in good condition and the colour of the light they produce is white, but with the blue bits taken out. Without in any way diminishing their brightness, they look "right" on older cars.
They generate a 250% increase in light output, but reduce the load on the car electrical system by 60%. No alterations to the wiring are necessary.