1 / 12

Taking a White LED Lamp Forward

Taking a White LED Lamp Forward. Stuart France. The 1998 version. 24 Nichia 5mm white LEDs Current controlled DC-DC step-up Oldham or CEAG headpiece Continuously variable brightness knob or 2-position pilot-main setting 3 x NiMH 18650 battery in Petzl box

flower
Download Presentation

Taking a White LED Lamp Forward

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Taking a White LED Lamp Forward Stuart France

  2. The 1998 version • 24 Nichia 5mm white LEDs • Current controlled DC-DC step-up • Oldham or CEAG headpiece • Continuously variable brightness knob • or 2-position pilot-main setting • 3 x NiMH 18650 battery in Petzl box • originally 6 volt Kirby kidney pack on lead

  3. Has anything happened in the past 10 years? • Microprocessors costing 50p • Software seen as an asset not a risk • Battery technology advances • Powerful single die white LEDs • Lenses for the above • LED torches become consumer item

  4. Updating the lamp spec • 3 x 3W Cree modules run at 2W (from Tesco) • 3 x P4 in triple lens dichroic unit also possible • Push-button on-off • Brightness knob • Current controlled step-up to about 10 volts • Microprocessor for: • Power on/off function • Battery voltage measurement • Battery state LED signalling • Green, green-red, red, flash main beam, force off, when: • 100-50%, 49-20%, 20-10%, 10-0%, 0% left

  5. CEAG caplamp shell • Totally waterproof • no charger keyway, no rotary switch • IP68 push button, IP68 brightness knob • IP68 metal cable gland, siliconed inside • Tall bezel for dichroic lamp modules • Black sleeve to stop scatter • Nitrile rubber o-ring

  6. Li-ion battery pack • Two 18650 cells, nominal 8V 2.5AH • Off the shelf £20 charger from CPC • Metal battery box, ends sealed with PU • Over-current cut-out • Two pin connector • spare line socket acts as a blanking plug • Attaches with super-velcro to flat area cast on rear of helmet

  7. Push Button • 3-second push to power on or off • Bicolour LED in middle shows for 15 secs after power off to indicate battery level • visible in cave when reflected off a hand

  8. Brightness knob • Gives 6-to-1 power ratio • Suits small and large passages

  9. Software • PIC12F675-04I/P (DIL8 package) • Easily reworked for other battery types • Battery monitoring can be disabled by jumper which allows any battery <10 volts to be used in an emergency • It will then deep discharge a Li-ion pack, and ruin it, but extract all the energy

More Related