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Old 03-31-2018, 06:25 AM   #91 (permalink)
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Default Re: SMD LED tape based light fixture

SMD tapes have current control resistors that keep you from adjusting the current. The LEDs are all in parallel, and they are designed to be powered with 12 VDC, whether you have 3 LEDs or 100 LEDs operating. You just need a power source that can provide the needed current, which means the needed power. The double width tape seems to need 24 VDC power. It should be possible to at least slightly adjust the current by adjusting the voltage, but I never tried that.
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Old 03-31-2018, 06:49 AM   #92 (permalink)
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Default Re: SMD LED tape based light fixture

I see. How do you determine the current power supply (current) depending on the length of the SMD strip?
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Old 03-31-2018, 08:27 AM   #93 (permalink)
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Default Re: SMD LED tape based light fixture

The tapes I have purchased have a total current spec for the whole reel of tape. So, I just went by how many reels of tape I was going to use, and rounded up a bit. Most of the tapes have a dimmer that can be attached, but I never looked into that. It's pretty hard to have too much light with those tapes - too little is the usual problem.
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Old 04-01-2018, 06:22 AM   #94 (permalink)
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Default Re: SMD LED tape based light fixture

Did you get the waterproof strip or non-waterproof?

***
I did a little digging.
https://www.saving-star.com/smd-led-comparison/
Check out the 3030 or 2835(c). Same current as the 5730 aka 5630 but much better lumens. Oh, but the watts is higher too, meaning the voltage is higher.

Last edited by mistergreen; 04-01-2018 at 07:14 AM.. Reason: update
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Old 06-12-2018, 11:37 AM   #95 (permalink)
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Default Re: SMD LED tape based light fixture

Bad News! This LED light has been in use, 8 hours a day for between 7 and 8 months now. I'm in the process of downsizing my aquarium set-up, so I have emptied the tank, cleaned it up for sale, and to improve my chance of selling it, will include this light. First, I measured the PAR it is now producing, and got 25 PAR at the tank bottom, less than 30 PAR 2 inches above the bottom. So, the intensity dropped from around 50 PAR to about half that in less than 8 months!

SMD LED strips, at least the cheaper ones, are clearly not going to last very long in this application. This is the last time I will use them. Back to Cree LEDs for me! Pay more, get more.

Curiously, my Finnex Planted Plus light has spent that same 7+ months as a desk light, on about 12 hours a day. It, too, is much dimmer now. It uses SMD LED's also.
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Old 06-12-2018, 02:28 PM   #96 (permalink)
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Default Re: SMD LED tape based light fixture

Good to know. Do you know how much intensity the Cree LED in 8 months?

I have some Cree LEDs but never measured when I set it up.
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Old 06-12-2018, 04:12 PM   #97 (permalink)
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Default Re: SMD LED tape based light fixture

I don't know how fast the Cree LEDs lose their intensity. Being pretty gullible, I am assuming they are as good as their website says they are.
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