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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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