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Estimated Delivery Time
2-8 business days
3-8 business days
2-10 business days
1-7 business days
6-14 business days
7-12 business days
China Post Air Mail
7-15 business days
China Post SAL
14-30 business days
30-40 business days
1. 3-5 business days for Sample Orders; 7-15 business days for Bulk Orders for Bulk Orders.
2. "Business days" means Monday-Friday, excluding holidays.
3. DHL and UPS cannot ship to military or P.O. boxes address
4. The Shipping Service above is for reference only, for any other questions, please feel free to contact us.
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Q:Led lamp generally not transformer, why also said some led desk lamp radiation levels
LED desk lamp is actually change pressure device, it's just the name is not called transformer. LED lights need drive power, has permanently flow drive and resistance capacity drive, usually 220 v50hz ac power input. Most LED lights use dedicated driver IC (internal electronic transformer), can supply a set or more sets of LED lights, more convenient and reliable. If the transformer is unqualified, radiation levels.
Q:When did you buy? If it is just bought, suggest you use first photoelectric charge again
the progress of the halogen lamp is incandescent lamp, full of halogen gas in vacuum bubble has realized the halogen tungsten filament with gas circulation and greatly prolong the service life of the filament, perfect inherited the color rendering of the incandescent light bulb 2, energy-saving lamps, CFL (compact fluorescent lamps, the actual domestic called the lamp energy-saving lamps have a little not science...). CFL is a great invention, the field of electric light source characteristics can be made into any color temperature and high color rendering, due to the effect of glow of the phosphor powder, stroboscopic can ignore (low temperature is a problem). Advantage is high luminous efficiency, such as 11 w CFLS can completely replace 60 w incandescent lamp, and use tricolor phosphors CFLS can reach more than 80 color rendering, some high-end products can reach more than 90 The disadvantage is that the fluorescent tube is filled with mercury vapour, how to environmental protection is a big problem in manufacturing and recycling, partly responsible manufacturer in tube using mercury pills (haha, suspected of advertising), partly solved this problem... P. : energy-efficient light bulbs are more likely to buy on the market at present stage is cost-effective light source
Q:LED rechargeable lamp, battery voltage is how many v?
The working voltage of LED (light-emitting diode) on different materials are different. Ordinary do remind instructions with phosphorus gallium arsenide material in between 1.55 V - 1.85 V; Gallium nitride material in 1.85 V - 2.15 V, the LED is red, green, yellow, orange glow (double color LED a variety of colors to choose from. General working current is very small, about 5-10 ma (0.005 0.010 A) A -- -- -- -- --, the brightness is not very high, can not be used for lighting. Using is a kind of super high brightness LED flashlight, its working voltage is higher, generally 3.35 V - 3.65 V, working current is relatively large, at 30 ma -- -- -- -- -- 50 ma, high brightness. Above is reproduced, the following is what I write. You can also in the baidu search is known here.
Q:How many watts of led the desk lamp that shield an eye with good students
If you can just can buy the dimmer Six or seven W has super bright commonly Look at those general is only 3 w LED bulbs
Q:Do leds have ultraviolet radiation
No radiation, now do the LED lamps and lanterns of domestic brands, are the main foreign market, in people life health check outside of yan song, somebody else can, let's also no problem to search
Q:LED bulbs can put in the desk lamp of adjustable brightness?
Bad,, it will damage the silicon controlled voltage regulator, The desk lamp of adjustable brightness can only answer the incandescent light bulb
Q:LED rechargeable lamp, what to do with the battery can't charge.
Possible reasons: 1, the LED is broken; 2, the damage of battery (this kind of desk lamp battery most poor quality). Light cannot be used when charging, so kind of desk lamp charging voltage is higher, will burn out the LED!
Q:Led lamp is broken. Who knows what reason be? How to repair?
Is the light of the serious failure, the main reason is caused by bad heat dissipation and current is too large, broken can't repair, change the wick
Q:How about the LED the lamp that shield an eye, ok
Of course there are good there, than fluorescent lamp is the biggest advantage of no stroboscopic. Buy should pay attention to look at the LED parameters: the first is the color rendering index Ra is more than 85, reduction of color ability. A second look at the desktop illumination, 500-800 Lux, don't be too bright, easy to produce visual fatigue. Third simulation under the child's reading position look have uncomfortable glare. About 4 color WenXuan 4000 k. I hope it can help you!
Q:Long card LED charging small desk lamp
Question 1, exactly how long is the charge? Ha ha, write on the package for 8 hours to eight hours filling bai, without packing on the accurate online said. In my experience to tell you, 6-10 hours can, usually about filling. Actually charge much less charge will only affect the service life of lead sulfate in lamp battery, lead acid battery is made of memory effect, its charge number is directly related to its service life, so full of as well. But don't forget to pull out 24 hours, so there will be no safety accidents. 2, charge how many hours to charge, charge is not enough time to influence? Already answered above, will only affect the life. Influence is very big. Suggest you fill 8 hours as well.