barbagris
Mad Scientist
- Joined
- Aug 1, 2010
- Messages
- 12,988
- Location
- On the verge of insanity
- Ride
- 1979 Guzzi V1000G5 - 2018 KTM 790 Duke
Scatter to me is uncontrolled light. If it's not passing over a reflectors or refractors (in this context) - in my book - it's uncontrolled and WASTED. And there is a lot of light coming off the reflector that goes where it should not - so it's scatter. A shield does not per se control - it blocks. I.e LOST LIGHT. If the shields reflect back any light (and they do so btw - and not in a controlled fashion) then it will almost certainly not bounce off the mirrored reflector as the designer intended - scatter.Thanks Barbagris, I went down to take a look at a HID bulb and yes Sir you are correct, they won't work properly within the Triumph headlight projector, or at least provide any benefit. Not to mention, as you stated it would be a challenge to find a spot to install the ballasts.
I also agree with your opinion with respect to if I wish to upgrade my headlights, do so with units such as the JW-Speakers.
You pose a lot of information that I find very interesting but I would like to interject on one of your points. Understood what you mean by light scatter but I have to slightly disagree with your definition. Scatter is when light from a source hits a reflective surface that is not uniform and it sends light rays in multiple, unintended directions. What I think you are referring too is light shielding. There are some halogen bulbs that have built in shields and some shields are built into the projector. This shield controls light output. As you described seeing the filament when you stare at it, this can hurt your ability to see/focus. Think of when you walk into a room with a candle, the glare from the candle hurts your ability to focus on what you’re trying to see. Most people put a hand up in-between the candle and their face to block light. Some projectors are designed to work with bulbs that have no shield but the Triumph projectors do not and I think this is why you refer to them as useless…I agree, poor design. I wonder if changing the bulb to a halogen with a shield would be better. It would not increase how well they work but would be better for oncoming drivers.
That said, I just checked my current halogen bulbs and they have shielding. Did earlier models come without shielding?
Cheers
I have been stopped twice on the R3 in Spain by the police for riding with blinding lights. An inspection naturally cleared me of wrong doing. Incidentally not are they only cruddy lights - they are incorrectly marked so despite being € marked - actually do not fully comply. The 17.5 next to the E13 mark is the homologated diameter in cms - they're NOT 17.5cms in diameter. 17.5 is roughly 7".
I did some sums a while ago and came to a number of about 15-20% of Triumph H4 dip filament light actually going where it's needed on the road. Given the average dip filament is rated (actually may be restricted to) about 1000lumens - this means very little usable light. Main beam is better as well as being rated to about 1600lumens - but it's still well shy of 70% useable - I've a mate in Hella who reckons closer to 50%. They are recessed further back into the light - so more light is controlled.
H4 bulbs have 1 shield - Below the low beam filament is a cup-shaped shield (called a "Graves Shield") spanning an arc of 165° so that no light can shine down onto the reflector and be thus projected forward (and upwards). And the end of the bulb is blacked (or otherwise painted/silvered) to block direct forward uncontrolled light. Some VERY EARLY H4's did not have the blackened bit - They've always had the Graves Shield.
The electromagnetic dipping H4 HID burners generally have a forward projection shield - but it's exactly this that wont fit into a Triumph bulb aperture. I have tried them in other 5&3/4" light units and on some this shield hits the lens inside face before the bulb seats correctly. - 5&3/4" lights are shallow.
Older light units additionally had built in bulb shields to stop forward light that did not first pass via the reflector. These were generally pre H4 (P43T) availability light units (P45T base) with a different bulb seat. These are still generally (ime) superior to most new light units. I have NEVER seen a 5&3/4" unit with one though - quite possibly because then the bulb would hit the shield before it seats.