If it feels hot, it's moving heat from source to sink (your finger). Most people have never experienced this, but if you were to take a solid silver spoon in one hand, touch the head to an icecube, nearly instantly you can feel your fingers getting cold.
If the head isn't getting warm, all of...
I'm tired of using my Nitecore units with their 'bad bays' (broke right after warranty). I can only charge 3 cells at a time, and even then the 'good bays' get confused now and then switching chemistries after the cell starts charging.
In short, I need something more reliable long term.
The...
You know, that's not that bad of an idea.
Hrmm.... there's usually just so much capacity loss for smaller cells I was thinking doubling it. But that certainly would be easier.
I have a couple of devices that have AAA batteries in side-by-side (where both + and - are on top). Uses one of those dinky steel battery connectors on the bottom.
Are there any lipo or similar setups where I could grind out some plastic and drop in a pouch battery? I could use a pair of LiIon...
Good morning
I'm looking for knowledge if anyone has come across a spherical pmma collimator for tritium spheres.
The other possibility is a small linear collimator. I'm trying to grab as much light from a tritium source and throw it's in a specific direction. The math of a parabola of a...
Do you have any closeups of the emitters? It appears to be 3,4, or 5 small (20ma) style in parallel within each diode. If thats the case, not a good choice for what I wanted. However if they're luxeon style large dies then they'd be grand for overdriving.
Thank you.
I've got to get me one of these. I need 6500K, and went with Yuji emitters in a custom mcpcb. But I love the violet pumped dies ever since GE sent me samples years ago. Luminous efficiency is for LPS.
From the video- are those 3 dies in each LED? I don't suppose you can measure the Vf across the string- I'm guessing the dies are in parallel which (would) theoretically increase failure rates.
Is there any heat pipe copper around the back of the arrays? I've always hoped someone would build...
Write Cree. Problem solved.
I wrote Phillips when one of their L prize bulbs went- I suspected a cap based on how it acted. I got a check for the purchase price a week later and a box to ship the failed unit back.
I got all excited... I couldn't find a spectrum but did find one for a t8 retrofit. Unfortunately R9 was 5.5...
I don't suppose you have access to a spectrophotometer... Or are near Rochester NY? :)...
OP still has only 1 post. Or I should say one that was deleted and then restored apparently for a class...
There have been almost 2 dozen DOE articles on color in the past year. My point was someone took the time to cite links, called a specific brand product, and then disappeared...
To give you a bit of context, I just lost my father, and I just returned from a baseball game with my son.
I am wondering if anyone has done any builds within an asperic lens element that has been installed in the reverse direction. While watching the game with my five-year-old it occurred to...
Yes. When their website started validating codes in English again they were authentic. The measured voltages matched my fluke.
The materials or parts sourced for the power cord/(and as someone that has gone thru UL and esh reviews) was severely lacking.
The chargers themselves have been fine...
Our facility has put in a few thousand. So far, no problems. We had 1 (that I know of) die ballast die, but that has been the only one so far.
The bulbs used are Phillips T8s. You don't say who the manufacturer of the ones at 5000K are- I'd check that though and see if there is any teardowns...