Recent content by alanmalk

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Going Gear
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    Light for an usher in a theater?

    Paper tickets? Is that something like paper money? 🤣 Its all on cellphones these days. Looking closely at the Fenix PD25R - touches many of the "wanted" items. Might add a ring of black heat shrink tubing around the head to restrict side lighting. Right angle head lights look like a...
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    Light for an usher in a theater?

    Thanks for the replies. I will investigate the lights that meet the "small, 2.5 inch, 2 oz, maximum". Red is not in the running since the patrons are coming in without any dark adaption - half blind. LEP is not in the running since stairs and chairs are only a few feet away to a dozen feet away...
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    Light for an usher in a theater?

    My wife works as a volunteer in a local theater and needs a light that won't bother other patrons or the actors on stage. The specific requirements: Small and light, say 2.5 inches long and 2 oz. Tight beam with minimum of spill - just needs to illuminate one step or a seat at a time. Simple UI...
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    Proper battery for high capacity, low drain use.

    No problem with identification of the device. A radio receiver turned on for 15 seconds every 5 minutes. 10-20 ma drain when on, nano-amps when off. Using a sparkfun TPL5110 for the timing. No provision for recharging the batteries. Ideal scenario is to remove & charge (or replace if...
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    Proper battery for high capacity, low drain use.

    The size constraints are just to keep the battery space consistent with the ePaper display. Or in other words, I probably will limit the battery compartment to roughly 4" X 4" just so I don't have a large container sporting a 1.5" display. Will investigate the "D" option. Yes, leakage is a...
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    Proper battery for high capacity, low drain use.

    May have answered my own question. I see some well-known brands at Battery Junction with protection. About double the price - but cheaper than burning down the house. Hopefully the microscopic drain won't be an issue.
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    Proper battery for high capacity, low drain use.

    I need a proper battery to use in a 3.7V -10,000 mAH pack, subject to low drain (20 mA or less) over a period up to a year. Was thinking that a couple of the 5000 mAH cells in the larger sizes, connected in parallel would meet the mAH requirements. 26650 would fit the bill but I note that most...
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    LumensFactory Seraph Modular system overview/review (Pic Heavy!)

    I've owned my SP-6 with default 3-mode, D26 module for about a week now, and curiosity finally got the better of me. Took it apart and measured the current drain using a Fluke 8020 and week-old Panasonic CR-123A batteries. High - 717 MA. Medium - 218 MA. Low - 41 MA. Might have fried the...
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    Princeton Tec Yukon HL is a dim bulb, anything brighter

    Your use of the word "suddenly" implies a component failure. You may want to sent it back to Princeton Tec since it has a life time warranty. I did so recently after opening the case with a hacksaw and finding exposed wires touching ground intermittently. My replacement arrived a few weeks ago.
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    A caver looking for a suggestion

    Since I was asked, I will respond but will attempt to stay on-topic. I used cap lamps (2) and carried spare bottoms filled with carbide in my pack. (Justrite and Premier bottoms are interchangable.) For the non-caver, the spare bottom is the equivalent of a change of batteries, the lamp's...
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    A caver looking for a suggestion

    Here's a thought from a caver who used carbide for 20 years... My second light was a second carbide lamp. My reasoning applies equally to modern LED headlamps. When your primary fails (say your Apex) and you are 15 hours back in the cave, you can switch to your #2 light - also an Apex. The...
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    I killed my Yukon HL, or did I?

    Went backpacking over Easter weekend. Wacked my head on a low tree limb and knocked my Yukon HL onto rocky ground. One of the 5mm leds went out and the two remaining went dim. When I picked it up, it flickered between two dim and three running normally, depending on how I held the unit...
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    New GID powder!

    It isn't just "glow-in-the-dark" - its also glow-in-the-light! This shot of the paint version was taken after a couple of minutes exposure to direct sunlight. The photograph was in my normal workroom light consisting of 1 partially open window shade, 75 watts overhead lamp and 25 watts reading...
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    Cree XR7090 vs Io Moon - Photo.

    Shot this photo to illustrate the difference between an Io Moon and a Cree XR7090. Left -> Io Moon (Jupiter) - Cool white, 70 degree. Center and right -> Cree - P3, 100 degree. These are all mounted 1.75 inches above white paper, driven at 200 ma, in series. (All 3 emitters get the same 200...
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    Ancient NiCd charger: can I use it to charge NiMHs?

    I am also using an ancient Radio Shack NiCd charger on my 2500ma NiMH batteries. The charging current is approximately 50ma so I allow 60 hours (5 days) for a completly dead battery to recharge. Frankly, I think I am doing more harm than good. Occasionally the batteries only seem to take a...
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