Good point about the braids, I assumed they should really be outside, hence asking
Ouch! 95 is pretty darn hot - that's the sort of LED temp I was getting when making a high-power LED project about a year ago; I was burning out a few with the thermal runaway I described. I ended up fitting thermistors & reducing the LED power gradually to keep mine below about 60C max. The braids as shown seem to be flat-packed; I assume you've spread them out as far apart as poss. maybe even compressed the braid length-wise to get the strands to expand width-wise & space themselves apart & get max air through? I might even be tempted to fit a diode between the controller & the LEDs just to drop 0.7V and reduce the LED power & so the temperature. It sounds as though these beasts have more than enough lumens as it is! I notice some of these designs have mini built-in fans to cool their heatsinks; I also had a fan to make sure my enclosure stays cool. Mine should arrive this Sunday.... I measured the temperature of the LEDs and the housing near the braids and it was 95 and 65 respectively...
I received my Greenclick LED's today.
They are packaged and presented quite well.
I fitted the nearside one first (easiest!).
I tried it and was suitably amazed at the strong light projected on the garage wall.
A great colour too, just the right classic HID shade.
So then I fitted the other one which is a bit more difficult.
I opened out all the braids to dissipate the heat.
I used double sided adhesive pads to stick the ballasts, and tidied up the wires as best I could.
I left the covers off the rear of the lights and made sure the braids didnt touch anything else, which isnt easy as its busy around the lights. I reckoned I would have to think carefully about what I would do about the covers.
Switching on was fantastic, the garage door bathed in blue-white light, with a noticeably different cut-off.
As soon as I hit the road though, I realised there was not as much light on the road overall as the Osram Nightbreaker Unlimited bulbs I fitted a couple of weeks ago. There might just be a little more immediately in front of the car, but further out where you need to see, I am afraid they are lacking.
So I would say they are better than the OEM bulbs, but not as good as the Osrams.
I have now swapped back to the Osrams and they are definitely better. They dont look half as cool, but they are better at lighting up the road, which is what I need them for.
I had high hopes for these, and I am gutted, but there you are. LED's now for sale!
My "Car Rover® 40W*2 9012 LED Headlight Bulbs 4800LM*2 Conversion Kit 6000k Hid Halogen Replacement Kit 12-24V with Cree LED XHP-50 Chip" from Amazon arrived. Being inquisitive, I've researched the chip spec. The XHP-50 can be wired for 6V or 12V, looking closely there are actually 4 small LEDs inside it, and these white LEDs usually run at about 3.2V, so that makes sense.
So a single LED is rated at max 6V 3A or 12V 1.5A depending how it's wired. That's 18W max either way.
But the more typical values as shown in curves in data-sheet are likely to be around 6V 1400mA or 12V 700 mA.
At these (sensible) values the light output ranges from 105% of nominal at 25C, down to 100% at 85C and 80% at 150C.
6V 1400 mA is 8.4W power used.
The 6000K colour-temp LEDs vary from 730 to 1120 lumens at 85 degrees C, depending on the quality (how the phosphor was made etc). Range is 837 to 1284 at 25C, but we know these are running pretty hot, much closer to 85C than 25.
I've connected one to my variable voltage PSU & cranked it up, measuring the voltage & current across the driver supply, and the voltage and current at the output of the driver circuit, where it goes into the LEDs.
Once the voltage gets to 5V, the lamp starts lighting up, and gets brighter as I raise the input voltage.
The LED supply stabilises at 6.4V 3.1A so the lamp's drawing 19.85W.
I can crank the psu volts up as far as I like, it draws about 3.5A at 8V and 2.06A at 12V so that's 24W.
Ok, time to do some stress-testing. Using my trusty IR thermometer I can point at various bits to see the temp.
Lamp is held in free air in a rubber vice, with the braids fanned-out as wide as poss to get best cooling.
Ambient temp is 19C.
A few moments after power on I have:
LED_Volts LED_amps LED_temp Braid-temp Driver_temp
6.38V 3.17A 85C 20C 20C
after a a few minutes this has changed to
6.24V 3.13A 96C 45C 48C
Time to stress it a bit, so I apply my hot-air paintstripper gun to the end of the braid to raise that to 60C.
After a minute of getting braid nicely warmed, I have
6.17V 3.12A 115C 60C 53C
and leave it to cool down a bit, a couple of minutes later I have
6.19V 3.12A 109C 35C 57C
Throughout all this the driver supply is pretty constant at 24W near as dammit. It looks like the driver is a current-limiting circuit, or just maybe a power-limiting one.
Conclusion: the driver's getting fairly warm on the outside, I'll probably try to glue/clamp a large heatsink to it. The chips on the inside will appreciate being a bit cooler if poss! These buck regulators usually have a capacitor on their output, typically 300 microfarads or thereabouts, and if it's an electrolytic (v likely!) these do not like high temperatures, and rarely have a lifespan of over 7000 hours at best. So the cooler the better for them. The items inside the driver have been epoxied in, so I can't see what the circuit they're using is, sadly.
The LEDs seem to be happy to run at around 110C, they're specced up to 150, so I don't have too many worries about them, provided I can keep them well ventilated when in the car.
I'll put these in the car tonight & have a play.
@Chronos please no need for apologies. I have wanted to try an LED for a long time. I completely agree with you that they are better than the standard bulbs.
However I have also tried the Nightbreaker Unlimited 9006 recommended by @HandyAndy and they are better still for night driving.
I now have all 3 sets of bulbs so I am able to do comparisons.
I really wanted these LEDs to be the best. Indeed if the LEDs had been just nearly as good as the Nightbreakers I would use them for their fantastic appearance.
But sadly they are not.
I think I will now order some HIDs to see if they can beat the Nightbreakers!