Muddymike wrote:
On 29/12/2020 15:11, Fred wrote:


"Muddymike" wrote in message
o.uk...
On 28/12/2020 17:46, Fred wrote:


"Muddymike" wrote in message
...

We have a need for a 100w+ LED outside light

Do you really need one that bright with a led ?

Yes.

Do you mean actual power consumed or incandescent equivalent ?


100w rating, so power consumption.
They do have a floodlight. Not cheap tho.
https://www.philips-hue.com/en-gb/p/...ight/1743530P7


Bloody expensive and still not 100w.

Mike



Here is an example of what 100W of electrical input
to a LED device can achieve.

https://www.amazon.co.uk/120w-Brite-.../dp/B00WUCV7D0

120w Brite Source LED Corn Light [claims 135 lumens per watt, unlikely]
6000k Daylight (that's a bluish white color of light, not 2700K warm)
17,000 Lumen (800 lumens is a 60W light bulb)
Replaces 450w Metal Halide [and then some]

You cannot put that item inside a globe.
It's powerful enough, it almost needs a bit
of fan cooling from the back. Fixturing that would
be a challenge. You don't want to fry it and kill it
in short order.

Being Chinese, I'm sure it dissipates 120W of electricity,
but they could be forgiven if the lumens were about
half of that.

Just for the record, LEDs work best if they "bounce off a ceiling".
That gives the nicest diffuse light. There are many light sources
we place outside which are "eye burners" and you have to be careful
where you position them, how you shape the light cone and so on.

One of the reasons the corn cob lights work well, is the
vast array of separate LEDs used. This approach avoids
phosphor smothering that happens when you try to make
a point source out of a really big LED. Even the 1" disc
arrays tend to smother. The corn cob should be pretty efficient
(even compensating for Chinese lumin fabrication).

*******

I have a couple conventional screw-in LED flood:

Philips 120W equivalent 1200 lumens (which is actually 90W equivalent)
14W input power

If we buy 7 of those, we get 8400 lumens. And, because being floods,
they have reflector and Fresnel lens, they can be pointed at a target.
Those things are miserable, and the last time I used them, I bounced them
off the carport ceiling to tame the light. That's while putting the
winter tires on the car (floor jack, jack stands). Those aren't eye-safe
if you get hit in the face by one. You'll be seeing the retinal burn
the next day.

There are also an unending supply of this form factor. This particular
one uses an array LED source on a substrate. These run off about 40VDC
that the SMPS in the light has to power.

https://i5.walmartimages.com/asr/3ff...5b792e3.jp eg

They also make that form factor with individual LEDs. This one seems
to draw 150W, but they don't state the lumens as a double-check. Just
another fake Walmart advert.

https://i5.walmartimages.com/asr/057...08231df82.jpeg

Paul