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Frequently Asked Questions

  • Can you do the design for us?

    Yes. We have a professional team having rich experience in box design and manufacturing. Just tell us your idea and we will help to carry out your ideas into perfect packing boxes. It does not matter if you do not have someone to complete files. Send us high resolution images, your logo and text and tell us how you would like to arrange them. We will send you finished files for confirmation.
  • Is LiangDi a factory or trading company?

    LiangDi is a factory, we are professional manufacturer of infrared terrace heaters and heating lamps since 1994.
  • Where is your factory? Can I visit your factory?

    We're in city Changzhou, middle of China. It's 1 hour by train from Shanghai, 2 hours by plane from Guangzhou.
     
    You are warmly welcome to our factory, we will be happy to show you our production, QC, warehouse, etc.
  • Can I have samples? Is it free?

    Yes, we are happy to offer samples for you to check and test. Depends on sample quantity and product model, we will confirm with you whether it's free sample or not.
  • How long shall I wait for quotation? And samples?

    Usually we will quote you the best price within 24 hours after your inquiry.
     
    As for samples, it will take 5-7 days.
     
    If it's special customized heating lamp, the time needed for samples could be longer.
  • What is your term of delivery?

    We accept FOB, CIF, EXW etc. Please choose the one which is the most convenient and cost effective for you.

  • What about the lead time for mass production?

    It depends on the order quantity and the season you place the order. Generally speaking, the lead time of MOQ is about 15 to 20 days. We suggest that you start inquiry at least two months before the date you would like to get the products at your country.
  • How to calculate the number of heaters required ?

    Coverage area: The reflectors on our short and long body heaters are designed to have the same spread. Even the 3000 and 1500 watt heaters have the same reflector and thus heat spread pattern. The general rule of thumb is the following:
    Each heater have an effective heat area of about 4 x 4 meters at a height of between 2.3 and 2.7 meter. When you standing under the heater the coverage area will be 2 meters to each side and about 4 meters to the front
    Heaters can be spaced 3 meters apart. This will create a small overlapped area, eliminating shade.
    faq3
  • Do you offer guarantee for the products?

    Yes, it must be. We guarantee 2 years for heaters and 5000-8000 hours for heating lamps. If it's customized heating lamp or heating unit, we will confirm with you the guarantee period in formal quotation together with data sheet.
  • What type of payment do you accept?

    T/T, L/C.
     
    We also accept Paypal, Aliexpress, Western Union for small amount.
  • Are they safe to use?

    There are two levels of safety:

    Your wellbeing: Infrared rays are not Ultraviolet rays. It does not damage your skin. In fact it s healthy for your skin! Infrared heat has been used for decades to treat injuries, grow plants, treat people with winter blues in countries where there's not a lot of sun and has various other health beneficial uses.
    Your safety: Usually our heaters get mounted at least 2 meters above the ground so it is out of reach of children! They are also fitted with a protective grid. Because we use high quality aluminum, the heater cools down quickly after you've switched it off, thus reducing the risk of burning accidents. All the heaters are electrically earthed and also rust free due to the use of aluminum and stainless steel. It is as save as a typical light fitting.


  • Why Short Wave Infrared ?

    Basically,the shorter the wave ,the more easily it travels through the air,Short wave infrared generates heat by heating the objects it meets with ,without heating the air around it ,Even effective and instant heat without pre-heating.A good example for this mode of action is the effect that occurs when a person walks out of the shade into the sunlight ,Although the ambient temperature remains the same,they feel the temperature as considerably warmer under direct solar radiation

  • Is it OK to print my logo on product?

    Yes, it's possible. But please kindly note we have MOQ request for different products. We highly recommend you using LiangDi brand, we will offer you extra discount.

  • What is Infrared ?

    Infrared is an energy similar to visible light, but with a longer wavelength.
    Infrared energy is invisible to the human eye, however, while visible light energy
    is emitted by objects only at a very high temperature,
    infrared energy is emitted by all objects at ordinary temperatures.

     
    faq1

    Since thermal imagers sense infrared energy which varies with the temperature of objects in a scene,
    the image generated provides a thermal signature of the scene. This image can be displayed on a standard video monitor.
    Infrared energy from objects in a scene are focused by optics onto an infrared detector.
    The infrared information is then passed to sensor electronics for image processing.
    The signal processing circuitry translates the infrared detector data into an image that can be viewed on a standard video monitor.

     
     
    FAQ2

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Address:  No.1 Weishanhu Road, Xixiashu, Xinbei, Changzhou, Jiangsu, China
Phone: 0086 519 83442673
Email: sales@liangdigroup.com