Generally speaking, SMD2835 LED tube is newer and more advanced than 3528. Because 2835 has more effective thermal dissipation system, specifically, a larger heat sink than 3014 on the back, and 3528 has no back heat sink at all, therefore 2835 is able to take higher current and generates more luminous flux. The form below is the common spec of these LED solutions in these days. The data is based on June, 2013.

The followings can be concluded from the form.
 1.Larger chip, the better
 Taking 3528 for example, manufacturer could use 10*16, 10*18 or 10*23 chip to make the LED, all can be driven by 20ma, three plans get different luminous flux. Because smaller chip would generate more heat while being driven by same current as the larger chip, it also has shorter longevity and worse quality. However, for most of lamp buyers it is almost impossible to know what brand and dimension of the chip is really being used, the only way is to conclude it from the lamp’s optical performance test.
 2.A controversial trick
 Higher drive current will make more luminous flux to one chip, and also more heat. 3528, 3014 and 2835 all use 10*23mil chip, but the drive current are different .It is controversial that because 3014 and 2835 have large heat sink, one chip in these packagings could be driven by higher current. However this has become the most popular design.
 specification:
Dimension: 26x1200mm
Lighting:Source SMD2835
 LEDs Quantity:96 PCS
 Power Consumption: 18W
Input Voltage (Driver): 85-265VAC /50-60HZ
Efficiency: ≥95%
PF: ≥0.92
Operation Temperature -40 ~ +50℃
CCT 3000K~6500K
Luminous: 1750lm (±5%)
Ra: ≥75
Bean-angle: >120°
Protection grade:  IP44
Net Weight :0.65KG
 
Features:
1.take high efficient constant current driving circuit for the SMD led tube,conversion efficiency >95%.
2.Separation circuit design,which meet CE/FCC/UL standard.                                     
3.3000 hours lighting decay less than 1%.                                                                   
4.Aluminum back cover and Aluminium PCB assure much better heat dissipatio,thus longer life span for the LED
 
We recommend you use frosted cover since SMD2835 LED tubes will be single line LED designed