Recent content by bobski

fenix-store
  1. bobski

    LEDs in GE grow light

    Not particularly confident. The spectrometer I used is a black plastic box with a hole and diffraction grating at one end, and a sample light slit and nm scale at the other. You look through the diffraction grating, point the slit at your light source and get a rainbow overlaid on the scale. The...
  2. bobski

    LEDs in GE grow light

    Can anyone ID these LEDs? The center 4 are deep red (640-665nm using a cheapie visual spectrometer) and the rest warm white (450nm driver band). It's hard to tell through the magnifier, but I get the impression the LEDs' base plates are glass. It's a GE PAR38 grow light, PN 93101232. Rated...
  3. bobski

    CREE 4Flow Teardown and Review

    For those playing with the bulbs, a note on polarity between the main and daughter boards: each board has a plus-in-a-circle registration mark on it - they should both be in the same quadrant. If you get it backwards the bulb just won't light... No magic smoke.
  4. bobski

    CREE 4Flow Teardown and Review

    Exactly. The bulbs I bought were only glued near the top and lightly half way down one side. Once the base is off, it's pretty easy to crack the glue joints and pry them open from the bottom up.
  5. bobski

    CREE 4Flow Teardown and Review

    I picked up a pair of these today (1x 2700K and 1x5000k) from Home Depot. I dislike both of those color temps (it's like the options are candle light or mercury-vapor) so my plan was to swap half of the emitters between the two bulbs using my hot air station. When I got home and watched...
  6. bobski

    Fenix HL10 [XP-E R4, 1xAAA Ni-MH or Alkarine] Review

    I got my HL10 through fenix-store.com... It finally showed up a few days ago. The store's latest news email said they're having supply troubles (whether that's due to popularity, slow production or both IDK) but are sending out backorders as the shipments come in. In case anyone else runs into...
  7. bobski

    *new* Fenix HL10

    Nope. End of april now. It would be nice to know what the hold-up is.
  8. bobski

    Rayovac Sportsman Extreme 300 Lumen Lantern - MORE INFO ???

    Sure there is. It's being marketed as a professional work light for arc welders. Just clip it on the welder's output leads and it lights up the work area between arc strikes. That way you don't need one of those expensive auto-darkening helmets... The light is bright enough to see everything...
  9. bobski

    - Sylvania LED Power Failure Night Light -

    I bought one of these from lowes back in '10. The power failure function died sometime between then and this spring. I picked up a replacement today and set about finding out what went wrong. As soon as I got the case open, it was perfectly apparent what happened:
  10. bobski

    New 2" LED cubes

    Re: beamshots Sure, that could be problematic if you're trying to take light meter readings from an image displayed on your monitor. :ohgeez: The point of a beam shot is to evaluate how the unit in question allocates the light it is spec'd to emit. Yes, it's possible that a HID-based fixture...
  11. bobski

    Rayovac Sportsman Extreme 300 Lumen Lantern - MORE INFO ???

    Maybe. I have a few of those single AA to D adapters sitting around... They're just appropriately sized spacer tubes. On the other hand, if you hold a group of three AAs together and compare to a D cell, you'll see the diameter is a nearly perfect match, and there's some lengthwise space left...
  12. bobski

    Rayovac Sportsman Extreme 300 Lumen Lantern - MORE INFO ???

    Not if the adapters run the three cells in parallel (all +s together, all -s together), rather than in series (- of one cell to + of the next). Series boosts voltage while parallel boosts capacity, so three 2700mAh NiMH cells in parallel should act like a single 1.25V 8100mAh cell.
  13. bobski

    Rayovac Sportsman Extreme 300 Lumen Lantern - MORE INFO ???

    We're talking about surface-mount components here, so the larger capacitor is still probably a few microfarads or less (though I've seen surface mount caps as large as 22uF before). That might smooth things out at high frequencies (in the 100,000 Hz range), but not at 100 Hz. The ole hand-wave...
  14. bobski

    Rayovac Sportsman Extreme 300 Lumen Lantern - MORE INFO ???

    Where would I find that? Differences I've noted so far: - On the aluminum bezel between the lamp diffuser and housing, the older lamp has the Rayovac logo printed/etched four times all the way around, while the newer lamp only has it once on the front (button face) of the lamp. - The alignment...
  15. bobski

    car lights in USA and blinding effect

    To clarify a little: The problem isn't just the bulb you're using, but the whole fog light assembly. The reflector, lens, bulb socket... The whole thing is designed to look like a fog light but not to act as one, thus being referred to as a "toy" fog light. Producing a controlled beam of light...
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