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  • Surferdude commented on JardineroUrbano's instructable LED Plant Growth Light2 months ago
    LED Plant Growth Light

    I built my grow lights using 3W LEDs. There are 342 LEDs arrayed in a 1 meter square grid. I used about 45% 620-630nm, 45% 660nm, and 10% 450nm LEDs. Since 3W LEDs are not really 3W, it actually uses something between 300W and 500W, depending upon what current you drive them at (I use 600mA - 700mA). A grid with fewer LEDs doesn't seem to be as successful. I got the constant current supplies from Aliexpress for $8-$10 ea. While I like building my own stuff, at some point I had to trade cost for time to get these done. Soldering that many LEDs already takes a LOT of time. The aluminum racking acts as a good heat sink. I used heatsink paste to improve the heat dissipation to keep the LEDs cooler.3W LEDs seem to be the sweet spot in terms of price per watt. Plus, having them arra...

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    I built my grow lights using 3W LEDs. There are 342 LEDs arrayed in a 1 meter square grid. I used about 45% 620-630nm, 45% 660nm, and 10% 450nm LEDs. Since 3W LEDs are not really 3W, it actually uses something between 300W and 500W, depending upon what current you drive them at (I use 600mA - 700mA). A grid with fewer LEDs doesn't seem to be as successful. I got the constant current supplies from Aliexpress for $8-$10 ea. While I like building my own stuff, at some point I had to trade cost for time to get these done. Soldering that many LEDs already takes a LOT of time. The aluminum racking acts as a good heat sink. I used heatsink paste to improve the heat dissipation to keep the LEDs cooler.3W LEDs seem to be the sweet spot in terms of price per watt. Plus, having them arrayed on a grid to cover a square meter means that the light is penetrating better because it hits the plants at all angles.Plants don't care about lumens. Lumens is not the same as photons. You need a PAR meter to get the true brightness of light from a plant's perspective. The scale of lumens is weighted in the green region because it's intended to determine brightness according to the human eye. If you use lumens, a green LED will appear to be brighter than a deep red LED, even when they provide the same quantity of photons. Photons toward the red end of the spectrum are cheaper to produce in terms of electricity, and they are closer to the wavelength that activates chlorophyll directly without intermediate reactions.

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  • Surferdude commented on Surferdude's instructable Rework a UPS With Massive Capacity6 months ago
    Rework a UPS With Massive Capacity

    That would require a pretty big fuse. For example, at 100% efficiency, a 1000W UPS would provide 8.3A at 120VAC. Convert that to the current required on the 24V side and you get 120 / 12 x 8.3 = 41.5A. That's probably more like a fusible link as used in automotive applications. I just keep the battery boxes covered to avoid anything falling on them and shorting out the leads.

    That model is DESIGNED to charge 24V (two batteries in series). You have to use the same battery configuration that your UPS was designed for. A 24V system is more efficient than a 12V system, so some higher power UPSs use the series config. Hope that helps!

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  • Surferdude commented on Surferdude's instructable Rework a UPS With Massive Capacity1 year ago
    Rework a UPS With Massive Capacity

    Great supplemental information for this Instructable!

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  • Surferdude commented on Surferdude's instructable Rework a UPS with Massive Capacity2 years ago
    Rework a UPS with Massive Capacity

    I have not experienced any problem with voltage drops and alarming with either the CyberPower 900AVR or the Power99/500VA UPSs that I've modified. Obviously I don't have a schematic and cannot analyze the charging circuit, but generally, charging circuits for lead-acid are designed to supply a given current-limited output and maximum voltage. If you increase the capacity of the batteries, then the recharge time will increase under these assumptions. But if you have outages that often, then you have other power issues to worry about that no UPS is going to resolve.

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  • Surferdude commented on Surferdude's instructable Hermes' Caduceus2 years ago
    Hermes' Caduceus

    Sweet! LMK if you have any questions.

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  • Surferdude commented on jessyratfink's instructable Pokemon Go Beginner's Guide2 years ago
    Pokemon Go Beginner's Guide

    I partially disagree here. BEcause of the way permissions are grouped, many apps seem to wany access to things that are not intuitive. I choked on giving Pokemon Go access to Contacts, and still have not come up with a reason why it would need that, though. However, you cannot know from the poermissions whether or not an app is a Security threat. I think what you're trying to say is that they are a PRIVACY threat. Yes, you're constantly giving up your position in real time. But other players (so far) don't have access to that information. So it can't be used to stalk you or harrass you. I've heard rumors about person-to-person interaction, like trading, coming out in the future, but the current game doesn't do that. Ingress, also by Niantic (as spinn-out from Google), DOES make...

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    I partially disagree here. BEcause of the way permissions are grouped, many apps seem to wany access to things that are not intuitive. I choked on giving Pokemon Go access to Contacts, and still have not come up with a reason why it would need that, though. However, you cannot know from the poermissions whether or not an app is a Security threat. I think what you're trying to say is that they are a PRIVACY threat. Yes, you're constantly giving up your position in real time. But other players (so far) don't have access to that information. So it can't be used to stalk you or harrass you. I've heard rumors about person-to-person interaction, like trading, coming out in the future, but the current game doesn't do that. Ingress, also by Niantic (as spinn-out from Google), DOES make it possible to track other players. Some user have built apps used by both sides that scrape the log and build maps of where other players are. They cannot track you constantly, only certain actions like destroying / capturing portals and linking / fielding portals.There are certainly things to give on pause, but I haven't seen anything that's a true security risk.

    Yes, all Pokestops are portals in Ingress (I've been playing Ingress for about a year and a half). However, not all Ingress portals are Pokestops. If you sign up for Ingress (choose the Resistance faction!), you get access to the intel map which allows you to see the portals anywhere without going there. It appears that about 75% of Ingress portals are also Pokestops. You can play both games at the same time, but I keep Pokemon open to hatch eggs as I walk. If you go to your app store, Ingress will show up as a suggested app with Pokemon Go.I've found that Ingress still works just fine when Pokemon isn't. Just a more mature codebase and probably fewer server issues as well due to heavy loads.

    The terms of service note that people should not trespass, etc. People are getting escorted out of cemeteries because they are violating the posted open hours. It's usually fairly easy to find out what those hours are. If you cannot find a sign, look up the location online. Most cemeteries are dusk to dawn, though some are 24/7. Sometimes the hours shown on a website are the office hours, not the cemetery visiting hours. And then you'll fimd some police officers who just don't like the idea of people playing a game in a cemetery: they claim it's disrespectful and harrass people. To be fair, I've found that police officers are VERY polite if you are polite to them and don't try to make their job more difficult than it already is with every night being National Night Out now (becau...

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    The terms of service note that people should not trespass, etc. People are getting escorted out of cemeteries because they are violating the posted open hours. It's usually fairly easy to find out what those hours are. If you cannot find a sign, look up the location online. Most cemeteries are dusk to dawn, though some are 24/7. Sometimes the hours shown on a website are the office hours, not the cemetery visiting hours. And then you'll fimd some police officers who just don't like the idea of people playing a game in a cemetery: they claim it's disrespectful and harrass people. To be fair, I've found that police officers are VERY polite if you are polite to them and don't try to make their job more difficult than it already is with every night being National Night Out now (because of PG).Not all portals that were submitted and approved in Ingress meet the criteria. Even though invalid portal requests were submitted, Not all were removed, and there are some in the wrong place because some Ingress players on either faction voted them up to give their own player(s) a "couch" portal or "work" portal. Niatic is no longer accepting portal submissions in Ingress, but you can still submit invalid portal reports. I don't see a way to do this in PG.

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