What is the difference between the two? I know most bulbs are the same for both 9003 and H4, which is why it seems odd for GE to make two separate bulbs.
The 9003 has more precise filament placement, but slightly lower maximum intensity than the H4.
Watch the prices on Amazon. I just got 2 pair of 9003NHP's for $12.95/pair a week ago. I see they are now at $39.99/pair.
I didn't post a link here, because I was unsure of that policy, but I bought a pair of GE NHP in H11 for $18/pair the other day on Amazon. A quick search of Amazon indicates that the deal is still on.
With some disappointment, I have to report that we have already burned one of these H11s out in our Acura MDX. This is a first for us; I've never had bulbs installed long enough for one to burn out (talking many years), and we lost one of the NHPs in about 8 months of light-to-moderate use. This car does not have DRLs and we don't use headlamps during the day, unless there is precipitation. Sylvania Xtravisions (actually marked OSRAM) have gone back in. I expect many years of service.
The interesting part is I had the Xtreme vision installed in 2008 crown vic (patrol car, and I forget the bulb number although 9007 comes to mind), we work night shift regularly and drive down rough roads, sometimes at speed, so plenty of use and vibration, and that set lasted twice as long. /me shrugs
On a side note, my Miata has a wiring harness that delivers 14.2v to 14.3v to the HIR bulbs (9005 and 9006, and I forget who makes them, they came from candlepowerstore.com), and it sees regular use at night, those have lasted for almost a year, although I will say they dont seem to be as impressive as they first were, maybe I've become used to them, or maybe the bulbs have degraded to the point its time to change them...
HB5 (9007) is inherently a much longer-lived bulb than H7. Also, probably quite a lot of voltage drop in the headlamp circuit of that (like every other) Crown Victoria.
They won't have degraded appreciably in that time, and won't for quite some time yet.
So is it safe to assume that the HB2 (9003) puts out more light than the H4? And, that the GE Nighthawk Platinum is the better choice in that bulb? JTrue, from the standpoint of what the two different technical standards permit. In practice, it's important to understand this does not mean an H4 puts out more light than an HB2 (9003).