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What kind of USB power adapter for a LED light source is a USB power supply lamp?
- no problem Use the USB power adapter output current are generally in the 500-600 ma. The laptop's USB port to provide 500 ma current. So the USB lamp current is absolutely not more than 500 ma.s
Desk lamp battery charging why not directly connected light emitting LED lights
- Ordinary pressure drop with the silicon diode rectifier is about 0.7 V, the series circuit is higher after the voltage sharing the 0.7 V, so your LED can work properly. Can be a little bit, the pressure drop on the diode wasted energy is 0.7/3.3 = 21, see, there are twenty-one percent of the energy contribute nothing.s
The problem with LED charging lamps?
- You look at the instructions, if 10 hours are used up, then the general new will be more than 10 hours. The big brands generally describe relatively conservative performance objective.s
The LED rechargeable lamps can charge while lighting? The reason?
- resistance capacity is determined the capacity of capacitance current, and the charging current is very small, generally in 1 u for many, the charging current is about 70 ma, 13, and light bead is usually a 20 ma, that is the lamp bead is 260 ma, so four hours to point to a hour, if charge while using, then charge electric light enough to use, the end result is the battery voltage drops to light bead, is about 3.2 V, that is to say the battery will discharge, after filling is filling in a difficult, because with lead-acid batteries.s
LED lamp stroboscopic serious, can you tell me the reason?
- Use digital camera LED lights have similar moire interference, should be a digital camera sensor scanning frequency and multiple leds blinking frequency with a certain relationship, lead to no photosensitive sensor some particular locations and appear black stripes. According to the phenomenon that the LED lamp is resistance capacity drive is premature. In general, if the LED lights use resistance capacity device driver, then stroboscopic frequency twice of the ac power frequency, i.e., using flash frequency 50 hz alternating current while the frequency is 100 hz, with 60 hz ac for 120 hz - under the frequency, the human eye or is there a way to identify: the five fingers outstretched rapidly oscillating in the lamplight, if can see "a lot of fingers in the middle of the swing range (shadow), you can judge the LED use the low frequency pulse power supply driver. If the LED is used inverter type constant current power source, then stroboscopic frequency up to 40 ~ 200 KHZ, wiggle the fingers in this light, the human eye of persistence of vision has been unable to form such as "image of guanyin", so it can be the difference between the judgments
What kind of light the lamp that shield an eye?
- The desk lamp, LED is better, although it will still more expensive than energy-saving lamp or the light bulb, but value: the choice of the LED to have the following key points: first, to see the shape of the LED lamp bead, must be patch (that is, a piece of aluminum substrate has a lot of square yellow dots), if the little lamp bead is spherical or several high-power lamp bead, decisively abandoned, because those are the old, bad for your eyes, just before the LED haven't rolling development to the mature technology;s
The led rechargeable lamps useless can also be used for a long time
- Is equivalent to ordinary emergency light put a period of time. You can use it's not a problem, if unplug Light is put out that the battery is out of date in a minute. Can replace the battery, or when there is no charging function normal use.s
How many watts of 10 square meters of the bedroom with led bulbs Warm white or white
- 10 square meters room are you in a light bulb or multiple light bulb? If a light bulb base lighting 9 w, 7 w must be bright enough. Since this is the bedroom must have table lamps, bedside lamp and so on as auxiliary. Tmall ef led bulb is good, 9 wled bulb is equivalent to 20 w energy-saving lamp brightnesss
Have you ever used of emergnecy vehicle lighting
- Emergnecy vehicle lighting can be used on Police,Fire engine, Ambulance, Sprinkler, Truck , Security Vehicles, Construction Vehicles, Emergency Vehicles etc.The product can be moun...
Why is strobe lights for cars important
- The led lightbar will be used in Emergency Vehicle.such as Police car, Fire truck,Ambulance and so on...Special lightbar with multifunctions for different kindsof vehicles.The Lens...
Do you want to have best outdoor lighting
- Beautiful lighting should never be limited to the interior of your living space. This spring, dress up your home's patios, porch areas, deck, and walkways with lovely pieces th...
How do traffic light cameras work
- Traffic light cameras, as the name implies, is the traffic light cameras, of course, not every intersection will be installed. This is to prevent people who do not obey the traffic...
How do the flashlights work from the aspects of diode
- A flashlight, it is a kind of handheld electronic lighting tools. A flashlight typically have a via a battery-powered light bulbs and focused on the mirror, and a hand-held shell f...