What is the initial brightness (lumens) when you first turn it on when cold, like 50 degrees F? 50% brightness or better initially? timeto fullbright?
1422110
I don't remember. It's been quite a while since I bought it. Full brightness is achieved immediately on this bulb.
866448
Lumins don't seem to mean much as far as brightness. I finally went by colortemp. Higher the temp the brighter. I just used a dimmer.
1873815
It takes just a few seconds longer to warm up when cold. The battery could also have a shorter lifespan in extreme cold as well, but generally speaking I had no functionality problems near 0 deg F.
704323
The Brightness is adjustable from the menu, if you load the software. I have adjusted mine to full brightness
222396
I put mine up, and I changed batteries after about 2 months, maybe more. It was cold at night also. This is pretty good considering the weather conditions.
773399
If the light isn't in lockout mode, it will turn on full bright with a full press of the button. With a half press it will turn on and allow you to cycle through the brightness levels.
2186338
I don't think cold weather can hurt this, as it's mostly just plastic (have to keep the socket dry, of course). As others have mentioned it's not very bright (makes a good desk lamp). Out of the 3 I bought, one went dim almost immediately. I kept it plugged in and used it behind an LCD monitor for wall backlighting, and it eventually brightened up to normal again. So if you get a dim one keep using it, it might recover.
316033
I found that it depends on the light. I have about 10 of these book lights (love them, btw). Some of these lights last about 30% longer than others (with batteries from the same package) so there may be some quality control issues at play. Important: The light does dim as the batteries drain (sorry, adunn, my experience doesn't agree with your answer). So even though you still have light, it's not the same bright light as when you started. After reading at least 60 novels by these lights, I'd say that you get bright light for perhaps 5 to 6 hours. You get moderate light for another 3 to 4 hours. At that point, the light is low. Yes, the page is still lit, but it's greyish, not bright. If your eyes have adjusted, or you're young with fabulous 20-10 vision, you're probably fine for another 6 hours. But me, I'm old and decrepit and can't finish the novel without having to change out the batteries for a fresh set. Also, keep in mind that temperature also affects battery life. Colder temperatures will drain them faster. I lose at least 4 hours of useful light at my mountain cabin compared to my valley home with these lights. Hope this helps! - tkh
903883
I live in Minnesota, I had installed the l.e.d bulbs and about a week later I think the cold weather affected them. I returned them for credit back to my account. hopefully this helps you.
520872
The low winter sun seems to be shortening the daily light life span. I hope it will return to normal after the winter. I have about 6 mos. on it thus far and until now was satisfied with the light's performance.
2238916
Color temp is around 5000K. As for lumens it's hard to tell. Maybe 100-150 lumens
806740
That's what I wondered too, if it needed to "warm up" first, or be in an extra-dark room. You may have a faulty one too like me. I had to tap on it near the bottom & turn it upside down & hold it it at an angle to get it to light up-not what you should do to make it work! Email Amazon & they'll fwd it to Scientifics & they should email you back w/phone #. I called them today & they said Fedex would pick it up next day & send me another one. So hope next one works! Good luck with yours! :)
1045221
I live in the great white north where the temps regularly drop far below zero. I have had no problems at all with my Feit LED flood lights. They light right up to full brightness.
1105511
It starts at brightest. And regardless of when you shut it off ie. What mode its on it starts at brightest when u turn it back on. I have to say I love mine. For the price it is worth it. It's not everyday I get to use a flashlight as good as this. This has become my go to light.
1231698
I have seen no mention of the color temp of the LEDs. I would describe them as cool to cold. To my 65 year old eyes, when lighting pages on bright whitepaper there is the slightest blue tint, but when lighting scores that have yellowed with age the light seems wash out the yellow and sharpen the notes. It makes both situations easier to read.
663293
I have been using mine for 9 months outside in hot and cold weather with no problems. If you haven't noticed, they have three different color temps for the bulbs, make sure they ship your preference. I have the White 6000K and the Warm White 3100K. The 6000K is noticeably brighter, but the light is bluish, similar to the color you might see in a car headlight.
1195714
They will be dim when ya first turn them on, they need about 30 seconds to 1 minute to reach full brightness