6.Service life: The key to quality relies on the service life that depends on lumens depreciation. The smaller lumens depreciation is, the longer service life lasts and hence the dearer LED costs.
7.Chip is the illuminant of LED and, it varies a lot in prices. Chip made in Japan or the United States are expensive. Generally, prices of chips made in Taiwan or on the mainland are cheaper than those Japanese/American ones(CREE).
8.Size of chip: Side-length represents size of chip. Quality of LED with large chip is superior over that with small one. Thus its price is in proportion to the chip size.
9.Colloid: As colloid of ordinary LED is usually made from epikote. Prices for LED with uvioresistant design and fireproofing agents（或：retardant、从化学角度更专业）are more expensive, and outdoor LED light-fixtures with high quality should possess superiorities as uvioresistant effect beside fireproofing. Each item indicates respective designs, moreover such designs are appropriate for various applications. Reliability design of LED light-fixtures includes factors as electric safety, safety on fireproofing, application setting safety, machinery safety, safety for body-health, safety application time, etc, which should be in accordance with international/national standards related in terms of electric safety.
10.LED lamp bead with Type 3014 may come up to light as 9-11 lumen as of single one.