the main reasons for these differences: (a) chip with the small differences in optical properties; (b) support package and reflective characteristics of the shape of small differences; (c) the process of solid crystal chip and the small differences in the relative position of stent; ( d) the precision dispensing equipment as reasons for closure caused by the stent and the mold section inserted between the deep location and small differences; (e) different sealed plastic model differences and the same shall be in a different mode after the number of differences caused by . as the main reason, caused by the same specifications, different led light disibution characteristics of the individual differences between specific performance.
advertising signsfirst of all, most of the lens more effective. the reason is, led light from the lens in the hundred percent export or polymerization; the mirror is different, not some light on the incident to the reflector light is radiated off. furthermore, the lens to protect the lighting equipment from dust, dirt, spray, and the lens, light weight, relatively small mechanical load, can easily reach ip 65 level of security. finally, production costs, mirror method requires zinc, and with a glass of the optical lens is not necessary. compared with glass lenses, plastic lens is also very obvious advantages, lighter, ductile plasticity.the early nineties the twentieth century the advent of outdoor led displays.
writing boardsimple application circuit in figure 2 pt4115 ac / dc current source driver ic directly on the head using the ac power the lighting needs of the application circuit is very simple, the use of low-cost ac / dc current source driver ic. driver ic is currently used mostly come from the switching power supply switch flyback constant current driver, with isolated step-down principle. into the primary side and secondary side feedback conol feedback conol of two types of applications, the secondary-side feedback conol system accuracy up to 2%, but about the whole application circuit requires more than twenty components; the primary side of the general feedback conol system accuracy of up to 5 -3% of the entire circuit is only required program components for at least 7-8 months.
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