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 Post subject: Shoulder lamp progress
PostPosted: Sat Dec 07, 2019 9:25 pm 

Service Number: A05/TQ2.0.32141E1
Country: United States
I found a 100 watt led lamp for cheap and a 5v dc-dc up converter. On a 4 cell battery pack I get about an hour of run time. I am looking at testing with a bicycle light battery pack that is rechargeable. The voltage output is adjustable and that controls the brightness. FYI the lamp is the same thing seen in flood lamps now. Light levels are close to movie level brightness at full power. this is still a work in progress.

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https://www.ebay.com/itm/263961952554
the light
https://www.wish.com/search/dc%20to%20d ... position=0
the converter

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PostPosted: Sun Dec 08, 2019 10:25 pm 

Location: Wellywood, New Zealand.
Service Number: A10/TQ0.0.82146E1
Country: New Zealand
Nice.
Can you link to the convertor product not via Wish please? Just looking at the URL makes me feel like my personal details are being harvested and posted on the darkweb ... :shock:

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A10/TQ0.0.82146E1


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 Post subject: Re:
PostPosted: Mon Dec 09, 2019 12:02 am 

Service Number: A05/TQ2.0.32141E1
Country: United States
septic wrote:
Nice.
Can you link to the convertor product not via Wish please? Just looking at the URL makes me feel like my personal details are being harvested and posted on the darkweb ... :shock:


I know the feeling. Wish is the best deal on that part. DC-DC converters in small factors that are cheap are mutually exclusive terms. I have not found an alternative board through local sources. The board is such that I buy several at a time as I do get a dud here and there. I usually buy in such volumes and with all the parts research I do any information harvesting would create a self corrupting database anyways.

I did some burn in testing and the adjustable voltage is a great boon. The board gets hot if cranked to the full 26VDC output. I dial it back to a bearable light level and heat output is negligible. The heat is nothing I would really be concerned about. Housing the board in the battery is not a concern either as the airspace in there will be sufficient.

Regardless I am having to scale back my cosplay stuff so I can focus on home maintenance in the coming year to finish a couple of major yard landscaping projects and such.

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 Post subject: Re: Shoulder lamp progress
PostPosted: Tue Dec 10, 2019 9:09 pm 

Country: Czech Republic
The seller is probably pulling everyone's leg with that 100W rating at 12V, but it looks pretty bright. What's the maximum current rating on that DC/DC step up board?


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 Post subject: Re: Shoulder lamp progress
PostPosted: Wed Dec 11, 2019 5:20 am 

Service Number: A05/TQ2.0.32141E1
Country: United States
M1861 wrote:
The seller is probably pulling everyone's leg with that 100W rating at 12V, but it looks pretty bright. What's the maximum current rating on that DC/DC step up board?


actually it is at about 26vdc. I scale it back a bit as the thing gets hot to the touch. I think the chip actually runs on 36vdc. So it is not even at full brightness...

at 12vdc it is not very bright. I would have to do a video with the volt meter hooked up to show the brightness scaling and can do that when I get a chance.

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