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Re: (ET) ET Headlights
The easiest way to the brightness you covet is to mount another factory
bulb next to the orig. I did it and it's the cheapest means of doubling
the output minus the cost.
Sent from my iPad
> On Feb 27, 2016, at 9:03 PM, Steve Welch <oneoldbird icloud com> wrote:
>
> David & all,
>
> Installed the new LEDs and cut new plastic clear lenses for the lamps.
> I'd say brightness is slightly improved over the standard incandescent,
> but not by a huge amount. Probably some of the improvement may be due
> to the colder light quality, but there may be some increase in absolute
> brightness.
>
> Since I don't really do much at night, I will probably run these until
> something dies, however if I was looking for a substantial improvement I
> would look elsewhere. Maybe to the ones Eric Adams recently posted
> about...
>
> I very nearly went with an off-road LED light bar that would have been
> similar in cost to the two of these bulbs and may well have been a
> better light. I would say that if the brightness of these new bulbs had
> been focused specifically on the turf, it might be adequate for
> dusk/dark mowing. But of course, it is just as limited by the stock
> reflectors as the stock bulbs are. Oh well - at this price point I
> don't mind a bit of trial-and-error.
>
> Best,
>
> Steve
>
>
>> On Feb 20, 2016, at 1:44 AM, David Roden <etpost drmm net> wrote:
>>
>>> On 19 Feb 2016 at 19:26, Steve Welch wrote:
>>>
>>> direct replacement LEDs:
>>> http://www.m4products.com/1142-17-5630-nw-natural-white-elite-series-wi
>>> th-brighter-samsung-5630-leds-1142-1076-ba15d-base/
>>
>> Watch out for those "calculated lumens." That usually means the spec
>> writers have simply summed the rated maximum output of the emitter
>> chips
>> used. The catch is that the chips can't all run at maximum output
>> continuously because they'd overheat, so they never deliver their full
>> outputs in these retrofit bulbs.
>>
>> I don't own a meter that measures lumens. That's lab stuff and
>> expensive.
>> To approximate the lumen output of various CF and LED retrofits, I use
>> 2
>> cardboard boxes (they really should be spheres) of the same size, lined
>> with
>> white paper. I turn off the room lights and put the test light in one
>> box.
>> Then I try various incandescents in the other box until I find the
>> closest
>> match in apparent light output. (The human eye is actually pretty good
>> at
>> matching apparent illumination.) Since the incandesent bulbs have rated
>> lumen outputs, that gives me a rough estimate of the retrofit's lumen
>> output.
>>
>> I've yet to try a 12v like this, but I've tried a few 120v multi-chip
>> ("ear
>> of corn" type) LED retrofits, all of them made in China. I find that
>> they
>> typically produce about one-third to one-half the claimed output.
>>
>> I looked on the website above. M4 products claim 640 "calculated
>> lumens"
>> for this little guy.
>>
>> They say it uses Samsung 5630 chips, but I can't quite tell from the
>> photos
>> how many (usually the specs say, but these don't). It looks like it
>> has 5
>> on the end and 5 or 6 pair around the sides, so maybe 15 or 17.
>>
>> The Samsung 5630 chip comes in various output ranges from S1 to S3.
>> Depending on range, it's rated for an absolute max of 28 to 32 lumens
>> at
>> 4000K CT. Thus I don't see any way that this retrofit manufacturer
>> (more
>> likely importer) could even calculate 640 lumens. Seventeen of these
>> chips
>> would have a "calculated" output of 476 to 544 lumens. And as I say,
>> you
>> can't expect to get that output in the real world anyway.
>>
>> http://www.samsung.com/global/business/business-
>> images/led/file/product/lighting/201312/Data_Sheet_LM561B_Rev.006.pdf
>>
>> Another odd thing. The retrofit bulb specs claim a CT of 4500K.
>> Samsung
>> doesn't show a 4500K chip in the spec sheet. Tthey jump from 4000K to
>> 5000K. That could be an error in the bulb specs on the website, or the
>> chips they're using might be knockoffs.
>>
>> I'd say put a retrofit in one side, incandescent in the other, and try
>> the
>> lights. If the pattern is similar enough, you can usually tell which
>> is
>> lighting up the garage wall better. And even if the retrofit has less
>> output than the GE factory incandescent, you may find that you see
>> better at
>> night with it because of its higher CT.
>>
>> Please report back on how it goes.
>>
>> In the end, if you're satisfied with the performance and think you got
>> your
>> money's worth, then that's what counts.
>>
>>
>> David Roden - Akron, Ohio, USA
>>
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>>
>>
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