It is like antenna gain. You have so many minimum lumens spread out over so much distance. Inverse square law. With the current LED efficiencies, that means 350-400 watts to generate that many lumens. And all the fixtures 300 watts and above have fans.
From: Bill Prince Sent: Sunday, July 2, 2017 12:59 PM To: [email protected] Subject: Re: [AFMUG] OT Heat pipe cooled LED array Back up one level on that link and there are lots of LED high-bay lights. Stay with ones that are less than 300 watts, and it seems like most of them don't require fans. http://www.ebay.com/bhp/high-bay-warehouse-lights bp <part15sbs{at}gmail{dot}com> On 7/2/2017 11:50 AM, Jeremy wrote: Seems like there are a lot of options without fans, using big heat sinks. Seen them for around $100-200 on Alibaba. Elsewhere they are harder to find. Something like this? https://www.ebay.com/p/Warehouse-LED-High-Bay-Light-22000-Lumens-150w-Replace-Metal-Halide-Lamps-400w/1572301990?iid=162441296579 On Sun, Jul 2, 2017 at 9:20 AM, <[email protected]> wrote: Exactly, near $500 and FANS! From: Adam Moffett Sent: Sunday, July 2, 2017 4:37 AM To: [email protected] Subject: Re: [AFMUG] OT Heat pipe cooled LED array Something like this? https://www.eledlights.com/led-lamps-by-type/high-bay-led-fixtures-low-bay-shop-lights/300w-led-high-bay-replaces-1000w-hid.html#.WVjMtYjytPY ------ Original Message ------ From: "Jeremy" <[email protected]> To: [email protected] Sent: 7/1/2017 11:13:20 PM Subject: Re: [AFMUG] OT Heat pipe cooled LED array Are there not already LED products available for replacing these type of lights? You just like tinkering, and want to reinvent the wheel, huh? On Sat, Jul 1, 2017 at 5:53 PM, <[email protected]> wrote: Found my vacuum leak. I am piping heat. So far so good. -----Original Message----- From: Chuck McCown Sent: Saturday, July 1, 2017 7:52 AM To: [email protected] Subject: Re: [AFMUG] OT Heat pipe cooled LED array That is the result of my no carb, no sugar survival diet. -----Original Message----- From: Bill Prince Sent: Friday, June 30, 2017 9:13 PM To: [email protected] Subject: Re: [AFMUG] OT Heat pipe cooled LED array You look a lot younger than I remember... bp <part15sbs{at}gmail{dot}com> On 6/30/2017 4:56 PM, Chuck McCown wrote: Progress is slow, but am making progress. This array is designed to replace all my 1000 watt metal halide high bay lights. It burns 330 watts. Trying to eliminate fans etc. If was was going to use fans I would have been done by now. But no fan is going to last 20 years.
