My 2010 rx450h calls for hid bulb as replacement. I have the original one replaced some three years ago d4s hid back then. I did ask then if I can use led bulb but was advise to stick with hid for good reasons. I want to revisit the same question now as I can see d4s led configuration. My headlight config have this capacitor at the base and I am not sure if it will accept the d4s led bulb or it can do some damage with the focusing. Thanks in advance for your help.

 

This following video may help you make a decision, basicly plug and play, no color selection, https://auxito.com/collections/led-h...nt-for-car/d4s ;

 

Just get another HID D4S bulbs. The headlight housing and lens are designed to work best with that bulb configuration and you will not see as well at night by substituting an LED bulb in there.
HID bulbs do get dimmer over time so it is a good idea to replace them every 7 years or so. You can also buy brighter D4S bulbs than the stock Philips version. Both Philips and Osram make brighter versions that do cost more. Philips Extreme Vision is one brighter bulb.

This is from a Reddit Lexus ES350 forum post a few years ago

​​​​​​Philips XtremeVision D4S +150% is *****-to-the-wall bright.

Osram Nightbreaker Laser +200% is supposed to be technically superior, given its +200% more beam flux claim, BUT I've tested both side-by-side, and I usually suggest that people go with the Philips. The Philips has possibly more appealing "white" color than the Osrams, and the "whiter" light plays a psychological trick: it makes us think the light is "brighter."

We got it used a few years back and I was fairly disappointed with the night time illumination. So now I’m thinking it might not be the headlight design, just shitty bulbs.

It's not the headlamp design. HID bulbs lose lots of light output as they age, and beam focus deteriorates. After 1500 hours of operation, only 3% of standard Philips OEM type bulbs are projected to have failed. But at the same time, they'll only be putting out 75% of the original number of lumens. That's halogen bulb territory.

Lexus also generally doesn't put shitty lamps on its cars; most, if not all, of its lamps have been exemplary.

Lots of people think their HID systems are shitty and end up doing stuff like baking open their headlamps, spending $1000 to JB Weld some new projectors in, and stuff like that, but the reality is that there's nothing wrong with Lexus HID systems, which are some of the best on the market. What's wrong in 99% of cases is that they're using 10 year old HID bulbs that still ignite but don't put out much light (not to mention electrode deterioration, which negatively affects beam focus).

And depending on how old the ES is, it might have a HID system. If it does have an HID system, it's probably a good idea to replace its HID bulbs as well if they're a few years old. After just 250 hours of operation, lumen output is already at 90% of original, according to the chart I linked above. I personally buy new HID bulbs on a yearly basis.

I would prefer to stay with the OEM type of color and not a super blue light. But brightness is the priority over color or even bulb life here.

OEM is likely just a standard Philips bulbs. Neither the Osram Nightbreaker Laser nor the Philips XtremeVision are the ultra-blue bulbs. They will "last" a similar amount of time as OEM bulbs, but will burn brighter. But really, I wouldn't worry about how "long" a HID bulb last--they can certainly last the better part of a decade--but at that point, they're like 98 year old people: useless for just about anything.