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Originally Posted by Arun_S I have 5th Gen City with Projector lamps, the car shop i visit is recommending to replace my Low Beam lights with Moco h7 228W, with 28000 Lumens.
As per him it is a direct swap, no cutting or replacing of wires. It is having cooling fans in it.
A pair comes to around 12k.
He saying replace both High Beam and Low beam with the same.
Does you suggest this a better option? |
Firstly do not go with Lumens ratings and wattage as are printed on products with obscure or not so well known brands. Lumens printed may be mostly calculated raw lumens and have little bearing in actual performance and standardisation. Some may be really good and some may not be, wether in output or construction or optical design. Go for reputed brands like Osram or Philip or Hella that have solid R&D and QC backing them. Otherwise there is a huge black import market out there that rebrand and repackage these LEDs most of which are of Chinese origin. I dont know what diode and circuit efficiency will be required to arrive at a calculated output of 28000 Lumens from 228 Watts of power draw. These are just bogus claims. Its a hit or a miss. If you want LEDs go for sealed LED housings that are designed for LEDs. The Housing and its design is much more important than the light source. One can hold at lit 100/90 W bulb in the hand. How far will the light go or what will be the diameter of the circle of illumination ? Now the same bulb in the right housing will throw that light clearly upto 500 feet on a dark night.
Frankly I will not go with LED bulbs in a reflector housing. The housing is designed precisely for the optical compatibility with the bulb and the filament design of the specified or identical halogen source. Any deviation will only result in suboptimal beam pattern and throw. This error will be magnified with the bidirectional output of LED bulbs no matter how good they are. Further since reflectors have limited scatter control post reflection the glare will increase drastically that is an unsafe situation esp with respect to oncoming traffic. The same may be more forgiving in a projector source for others though it may not necessarily mean better visibility. Please do look at the design of an LED housing and study the diode placements in them. They are very different and optimised for LED sources. And when comparing with headlights always look at a long beam throw design.
I find most people are wowed by the greatly enhanced brightness of an LED source at near and middle distance. The design of all reflector and standard projector housings are for halogen or sometimes HID sources which are both omnidirectional. the construction of the LED bulb allows only directional light and the plate no matter how thin comes in the way of the reflection from the rear of the housing. In a standard headlamp design this reflection from the rear is the part of the emission that increases the distance the light travels farthest and constitutes the centre of the hotspot. Hence LED sources in halogen reflector housings invariably have weaker hotspot centre that reduces range penetration.
Further the greater light intensity and scattering of light in near and mid distance is actually a disadvantage in my experience. It actually restricts distant vision since the brighter light constricts the pupil of the eye and makes it less sensitive to objects that are farther and lower lit up. It compromises distance vision in the darker areas ahead leading to an illusion of greater light yet lower range of vision. In effect it shifts the vision closer.
Two examples I can site personally are as follows. My Abarth has a decent reflector and range throw on H4 55/60w halogens. 7 years ago I installed Morimoto H4 HIDs (4300K) with 55W Morimoto ballasts. They were extremely bright but I was never happy with the long range performance of high beams esp with incoming traffic. I burnt out a bulb 2 years later and swapped them for plain old 100/90W with relays that I had experience 18 yrs ago in my Ikon 1.6. I was much more confident with the 100/90s than I ever was with the Morimotos. Subsequently I changed the Fogs to 3 inch IPH 612s with H9 bulbs. When turned on together my light intensity became comparable if not better than the HIDs in near and mid distance but without any useless broad ambient scatter and they killed it in the resolution they offered in the far distance. Yes the tint is yellow but the idea that whiter light is more light is an illusion. I prefer the better contrast and shadows of yellow light as contrast is the key to discerned visibility in lower lit farther objects. It helps me pick up distant objests better. Whiter light beyond the mid distance appears more washed out and makes things appear more homogeneous and seems to offer lower contrast.
The second example is that of the Compass. I have the 4x4 Ltd model that has the single shutter projector with a single HB3 bulb. This was inadequate to say the least and has been commented upon by all Compass owners accordingly. I upgraded to OSRAM 50W LEDs and after quite some effort managed to get a near perfect beam pattern and throw. Most of my stuff is DIY and it is both effort and time consuming. But no matter what there was always a slight intensity drop at the centre of the hotspot. this is not evident at 1m, 5m or 10m but becomes evident at 20m range. While the near and mid range illumination blew away the previous HB3s (I had the Philips NB unlimited +150 and I have perfected a technique to rub away the blue band coating that then became distinctly better than a std HB3) the far range vision on a long dark stretch was only marginally better. It gave me twice the intensity but did not enhanced the range much. I firmly believe that better night vision = better range of vision and not greater intensity. There is no point being Centre Stage with the Limelight all around that is enough to make you squint if you cannot see far enough where you need to see. In flying when coming in to land at night with landing lights that are adjustable in elevation there is a saying that "One must ride the beam that is to see over the beam and not through the beam so that the object ahead of and around the beam focus is also visible. But I did not want to give up. So I replaced the fog lamps with another set of IPH 612s to keep it flexible for all ie halogen, LED and HID. I initially installed HIDs (same Morimoto ballast with OSRAM H11 4300K bulbs and it was amazing but I removed it with a sense of guilt as I was being flashed frequently by inbound traffic. I adjusted everything but the intensity was too much in combination even on lows. So I could switch on either of the two at a time safely which defeated the purpose. Next I installed a set of OSRAM 50W LEDs. The flashing was marginally reduced though I had genuine 200W of OSRAM diodes staring into the night. On a dark night upto 100 ft in front of the car was as good as daylight but the range penetration was still somewhat better as the fog projector with LEDs throw as much to the sides as upfront. So in effect the output is not well condensed at far range. Also the high intensity in the foreground and mid ground further made me less sensitive to the darker objects far out.
Having dissatisfied myself a bit I finally decided to try the PHILIPS HIR1 9011 bulbs. I could have done it before but the Bargaining Indian in me had always scoffed at the idea of importing a pair of, well, just Halogen bulbs, for Rs 7K. But when I installed them and went out into the dark night the High Beam blew my socks off. For comparison a H4 bulb at 100W is rated at around 2300 Lumens. So I was getting slightly more than 2300 Lumens as the projector lens accounts for a slight extra loss. one may subtract 50 to 100 for the reflection losses and roughly half of the value for the additional lens. In fact because of the lens the beam was much tighter than that from a 100W bulb in a reflector. This in effect increases the actual Lux value at the beam centre or hotspot throwing focussed light farther down. I could have used a 100W HB3 but I never use a over wattage bulb in a projector housing as projectors are tight and compact spaces that does not allow for dissipation of extra heat easili and the same will surely damage the housing. Reflectors esp the ones in bigger housings are much more forgiving of high wattage bulbs.
The 9011 didnt throw as much peripheral brightness as I had gotten used to and in comparison to HIDs or LEDs appeared dim on the side and up close to the casual eye but I could see better much farther out. It is then I realised that the LEDs in the Fog 612s were actually constricting my pupils and limiting my long range vision with their high intensity upfront. Promptly I got myself a pair of H9 bulbs and installed them in my IPH housing and finally hit the sweet spot. I am now really happy and comfortable with it. I dont get flashed and am not burning mine or anyone else's retinas and can actually see farther more distinctly. My peripheral vision through the side windows in the dark has also been restored. As a cherry on the cake I am in the process of retrofitting a set of Hella Micro DEs with 55W H3 bulbs that have been lying with me from an older car that I no longer own. I have bought a spare lower grill from Jeep Service and will custom install the same myself from inside and thereafter change the grill and hook up the circuit at the workshop. I intend to use a relay to power the same and the pick from the relay will be from the rear fog lamp line. For the Hellas it will ensure the separate switch of rear fogs that is existing in the car. This is because I now intend to use the 612s in my fog housings as Aux Lights and I have now modified them to be on a permanent High Beam only to be used when required on long lonely roads and in the jungles that I frequent. And also because though the IPHs are marketed as Fog Lamps their throw pattern is such that in genuine Fog conditions they will create glare and a wall of light in front. For Fog Lamps to be actually effective in dense fog (And I have driven a lot in dense fog from the Himalayas to Meghalaya, Wellington and even good old Kasara Ghat) they must be of medium intensity, mounted low, pointed down towards the road such that they should ideally not illuminate more than 15 to 20 feet ahead. Else in actual fog the scattering of light from a source that is pointed straight or placed higher will cause a lightout akin to what is called as a whiteout in visual flying. One has to understand that one cannot penetrate proper fog with light intensity. I will backfire. One needs to undercut it to see the near ground at low speeds and not look into the fog. Thats the aim of Fog Lamps.
Anyway, its been a very long post but for me the end point is to be judicous, calculated and observant rather than just going for "More the Merrier" approach. The solution may not lie in overdoing it without understanding the datums and metrics. At the end of the day it is back to the comforting and good old halogen with the existing hardware for me and I am happier for it.
Just for the fact book a 9011 HIR is around 2500 Lumens and H9 is around 2100 Lumens. A good HID from a reputed standard brand is benchmarked at around 3000 Lumens. There is a school of thought that says that there are no true 55W HIDs. Cant comment on that but none the less the difference between those marked 35W and those marked 55W is at best 20 percent provided they are from reputed and standard manufacturers. I have used both types of bulbs and ballasts in another car and sold them with that car. Most HIDs cope decently in a halogen projector setup though the optical light source is not identical. Unlike a straight filament an HID bulb has 2 point sources at either end with a small light arc in between as the total light source that does create small to measurable differences in beam pattern depending on the design of the housing. From my experience of the OSRAM 50W LEDs, they sit somewhere within a 20 percent output range of an HID bulb but render a worse beam intensity and pattern than the HIR1 rendering them of lesser efficacy at long ranges, though for LEDs in a Halogen housing they are close to being spot on optically unlike most other LED bulbs. Their only undoing is at the longer end of the High Beam range.
I will take the beam pattern of a good and powerful halogen bulb in a halogen housing any day over any other type of light source placed in it. If you want HIDs or LEDs then at least retrofit good projectors for the same. People and companies invest and spend a fortune designing and making them. All that glitters may not be gold. Better to find a method to the madness.
