Skibane wrote:So, what's the verdict?
Okay, in one word, the verdict is "okay". Not great, not bad, just okay.
An explanation is in order, along with background to keep it all in context. It's a long read, but necessary to fully explain it.
I have for many years driven extremely fast cars the way they were built to be driven, that is, at or near maximum capability. Much of that driving was at night. The ability to see far enough ahead to stop from speeds in excess of 150 MPH is critical to survival. That distance is measured in many hundreds of yards. Jet aircraft have landing speeds over 135 MPH, hence need extremely bright long range landing lights. I used to use TWO pairs of them, one pair @200,000 candlepower each in place of standard high beams, and one pair @ 290,000 candlepower each as auxiliary supplemental lights. Both had very tight beams to reach out a long way. The high beams were adjusted to converge on the road at maximum range. The auxiliaries were adjusted to converge approximately 3' above the road at maximum range. With these lights, I regularly ran 150 MPH plus and felt safe doing so (there was NO traffic when I did this, and it was only done on good well known roads).
Fast forward: When I got my '94 Q45t, I replaced the high beams with 100 watt halogen bulbs. Thanks to the beam focus, they reached out pretty well. Nowhere near what my old aircraft landing lights did, but considerably better than the stock bulbs. I estimated they were good for driving around 110 MPH at night, maybe a little more, possibly 120 in good weather.
Fast forward once again. Upon driving my new to me 2005 Q45 at night, I was duly impressed with the xenon low beams. The beam pattern and light output illuminates the side of the road as well as the pavement quite a long way. I estimate them to be good for approximately 65 mph, quite fast for low beams. The high beams were disappointing though. Stock high beams didn't extend the range much more than about 5 to 10 mph worth, or maybe 75 MPH.
I finally had a chance to test the new HIR 9011 Halogen Infra Red bulbs. Unfortunately, it was a Saturday night, and everywhere I went there was too much ambient lighting from street lights and businesses, and traffic was so heavy it precluded much use of the high beams except for a few short intervals. High ambient light reduces the perceived light from automotive lights, so my perceptions were a little skewed. I will of course try again at another time when conditions are more suitable for testing.
My impression of the lighting on the F50 so far is this: Low beam performance is superb, the best I've ever seen. I feel however that the reflectors for the high beams is designed to produce high light dispersion, to allow adequate side-lighting and to reduce loss of beam upon traversing dips and rises. In other words, the light is spread out in all directions rather than being focused into a tight beam that reaches out. In fact, the effect is almost as if the high beams are aimed outward from the centerline of the car, rather than converging at maximum range, as they should be.
Accordingly, the irrefutable increase in light output from the new HIR bulbs isn't able to extend the range as greatly as it might, and in my book, should. Total perceived light is increased by approximately 25 to 30%, but it just doesn't extend out like it might with a better reflector design.
Unfortunately, increasing the light output enough to improve range considerably with the existing headlamp assembly would probably create enough heat to melt the plastic lens and reflector. Even so, because of the high dispersion, the high near-brightness would likely obscure the improvement in long range lighting at night due to the eye's function at night.
I break down visual range at night into three groups, near, intermediate, and distant. Near and distant have only one value, but intermediate has three; intermediate near, intermediate medium, and intermediate far.
Stock high beams have moderate intermediate near, fair intermediate medium, poor intermediate far, and no distant. Max safe speed 75 to 80 MPH.
HIR bulbs have almost 50% increase in light output, but because of the reflector design on the F50, maybe 25% is enjoyed by the driver, thanks to the high degree of light dispersion. Accordingly, I rate the lights with the HIR bulbs this way:Good intermediate near , moderate intermediate medium, fair intermediate far, and poor distant. I rate max safe speed approximately 95 MPH.
So, after this admittedly long read, what's the bottom line?I believe the HIR 9011 bulbs are a good value considering the parameters they are forced to operate in. I know of no other bulb that will safely provide more or better high speed lighting, even though the limit of speed at night with them isn't as high as it might be with a car that had better reflector design. In other words, they're as good as you're going to get with the stock headlamp assembly.
The only workaround for this would be to install auxiliary lamps on the front end, possibly alongside or even in place of the fog lamps. They would preferably be at least 100 watt Halogen, with fairly tightly focused beams, and of course properly wired with minimum 12 gauge wire and powered through a relay. A little research might find either a good compact high power driving light, maybe even one that uses an HID bulb, that would fit in the fog light openings or could be easily installed alongside of them. If anyone has done such a mod, I'd dearly love to hear about it. If anyone who is interested in improving the safe top speed of an F50 beyond 100 MPH has the inclination, time, money, and ability to experiment with auxiliary driving lamps, I suspect that others in this forum might appreciate the input as much as I would.
In closing, if you drive an F 50 and do much night driving at high speeds, I strongly urge you to replace your high beams with the HIR 9011 bulbs, and to limit your night time speeds even with them to below 100 MPH.