You can buy replacement LEDs for the Holley’s.The Holley, when it fails...you buy a complete unit. Hella? Put in a new bulb.
You can buy replacement LEDs for the Holley’s.The Holley, when it fails...you buy a complete unit. Hella? Put in a new bulb.
Incorrect..The hellas come with an H4 incandescent bulb. You can (and I did) change it for ANY H4 style light. I run HID in my low/hi units, and LED in my high beams.
The Holley, when it fails...you buy a complete unit. Hella? Put in a new bulb.

No...That's a Holley H4 LED bulb...is that what the Holley light assemblies use? I was under the impression they were sealed units.

Yes, it plugs into the vehicle wiring harness.No...
It is a plug-in module, easy to swap out also note these are available through Summit, Classic Industries and even Amazon..
Just my $0.02..![]()
It still looks to me like the RetroBright assemblies are one sealed unit...maybe someone who has them, can check and verify one way or the other.
No problem, the Holley’s will withstand a hit by a rock over a regular glass headlight.Got it.
I stand corrected, thank you.
Note that Holley sells the housing by itself without the LED module..Yes, it plugs into the vehicle wiring harness.
I still think that is Holley's version of an "LED H4 bulb", to use in any H4 housing. I don't see anywhere on Holley's site where a) the RetroBright units have removable bulbs, or b) where the bulb you show fits the RetroBright housings. It still looks to me like the RetroBright assemblies are one sealed unit...maybe someone who has them, can check and verify one way or the other.
But I'm still partial to the glass-lens Hellas...and their MUCH lower price....

again...change to an LED or HID bulb when you install, and both your current draw and your service life issues are addressed. 35w H4 HID, $35 a pair; H4 LED, anywhere from $20each and up.50% higher current demand and shorter service life..
The numbers on that chart mentioned are carefully measured numbers using the same equipment for all bulb types listed. The are the actual numbers for both sets Retrobrights I own. The stock headlight wiring and related components were barley able to handle the OE sealed beams without significant voltage drop when they were new. 50-years on, there is no reason not to run relays, any bulb type will benefit from minimal voltage drop and reduced current stress for the stock wiring/components.A couple of technical points when comparing competitive headlight products...
For the supplied chart the indicated specs for the Holley retro-brights are on the higher side vs actual measurements by about 20%.
Just my $0.02...![]()