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    Dual Mode RV Porch Light

    One possibility is 12/24vdc automotive "auxiliary" lights meant for vehicles but supplied with brackets so mount to any flat surface. Many are "spot" type but "flood" does exist. Most appear to operate at full brightness only, no facility to dim directly; but there are ways around this. CCT is...
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    Dual Mode RV Porch Light

    Also, what level of illumination do you want (approx. lumens) and at which CCT (warm, cool, neutral)?
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    Am I the only one who drives the speed limit?

    Around here, controlled-access Ontario 400-series highway speed limits are usually 100kph, some being upped to 110kph which I think is heading in the wrong direction for reasons including fuel efficiency. I believe majority of small passenger cars (4 cyl.) are most efficient in 80-90kph...
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    Nearly half of U.S. households use LED bulbs for all or most of their indoor lighting

    Some specialty A19, small spot bulbs, and ceiling lamps, offer 3-5 CCT settings which they achieve by mixing (or not) two sets of LEDs. Switch mechanism ranges from switch on body, rotary switch in base (klutzy), to toggling power switch (convenient); some use dimmer but have tint v. brightness...
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    Anyone can help identifying this LED flashilight driver board?

    Not sure if the name "Olympia" on PCB top means anything. Looks like an older design by the toroid inductor. Dave
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    Dual Mode RV Porch Light

    Is this 12vdc lighting, or 120Vac (inverter/generator)? I would also ask what your budget is for this, as some recommendations come in at high prices (but usually not mine :) ) Dave
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    AmazonBasics AA batteries

    Reason I ask is older cells with higher internal resistance at some point do not like charging at high rate. I notice C9000 charger has programmable charge rate; what rate are you using? If it's fairly high, you could try reducing it. I keep low-rate chargers (even "dumb" chargers) around for...
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    AmazonBasics AA batteries

    How long have these been in use, how many times charging? Dave
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    Anyone can help identifying this LED flashilight driver board?

    Interesting, sorry I can't help identifying it but like opening up things to look at them and try to figure them out. Is the 14-pin SOIC on the top marked? Can't see any but might be the angle. Often, markings are removed to (try to) protect design from copying. Beside it is a 2048-bit...
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    The Official CPF Coffee Thread. All things Coffee... (And related beverages)

    As long as you don't try it in a cafe in Albuquerque NM...with chamomile tea and soy milk... Dave
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    Charger for C Cells - Need Help

    Lowest-cost Tenergy above ($25) charges at 600mA, seems pretty good (but I don't own one); would charge in around 5 hours. I also like that it does individual cells, does not require pairs (such as 3 cells). Dave
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    Charger for C Cells - Need Help

    What is cell capacity and how fast do you want/need them to charge? Dave
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    Simple 18650 headlight for elderly

    Ok, but I could make a similar argument for external charging/handling/storing etc. of Li-ion cells; not for everybody including people who are not elderly. Dave
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    Rulag 2 Volt sealed lead acid batteries - model RL-4

    You might try a lithium AAA (primary) which has working voltage 1.8v down to about 1.6v Dave
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    Recommendation for Affordable LED Emergency Lantern

    Just re-read post and description, looks like cell(s) are swappable which is fine. Dave
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    Recommendation for Affordable LED Emergency Lantern

    I like than light despite that it runs on AA. Mine may be older version; the base detaches (twist off) and can be hung upside-down from its hook on the bottom. Dave
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    Recommendation for Affordable LED Emergency Lantern

    If the Li-ion is not removable, when the light runs down you will have to wait for it to recharge, which could be an issue. I prefer lights which support instant cell swap-outs (C, D or even AA). Dave
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    Favorite budget light 2022

    My error, cell capacity marked is only .122Wh which is 33mAh. Inner cavity could allow a slightly larger cell if I can find one of the right size. Dave
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    Disappointing trend in LED manufacturing

    Agreed; I have acquired a variety of automotive LED lamps for purpose of operating from 12vdc, not for automotive use as I suspect most would not meet required standards; that is topic of other discussions on this board. Smaller lights including marker, running/brake/signal, and small interior...
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    Disappointing trend in LED manufacturing

    I agree in general, for high-power LED lighting resistive current limiting is usually not practical. It is generally done with switching constant-current output drivers. Linear constant-current regulators will work albeit not for street lighting. To cope with line variations they would need to...
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