1. Bottom base is  normally made of cold rolled iron, finished with powder coating,its anti-corrosion performance is good, not easy to shade and be worn.
Also we have  matte aluminum, mirror aluminum, stainless iron, stainless steel, peritoneal iron and other materials for your choice.
2. The cover and reflector is mainly made of alluminum having high reflectivity.
3. The grid shape could be V shape as picture or I shape.

T8 Fluorescent tube, cheap and good, two years warranty.

Name: Voltwell electric ballast, one kind is one ballast controlling one tube, another kind is one ballast controlling two tubes
Model: V3Yg-118-A/V3Yg-218-A
Voltage: AC220V
Input frequency: 50—60HZ
Output power: 18W /36W
Output current: 160mA
Power factor: >0.95
Outer Dimension: 267*30*19mm /343X30X19mm
The driver meets the requirement of safety and electromagnetic compatibility.

Two kinds magnetic ballasts for your choice:
1. Ballast made of copper wire.
2. Ballast made of alluminum wire.

Ways of installation:
Check the strength of screws, derrick and keel can support the, to ensure it can withstand the weight of the lamp panel.
step1. Remove the reflectors or film, knock off  line hole of  power supply, confirm the installation hole or hanging rod size and position (figure 1).
steps 2. Both hands hold up plate body, fix the surface-mounted lamp with derrick or screws, Embed the recessed lamp into the ceiling, and firm it tightly with iron wire, make sure each line hang straightly and force equilibrium (FIgure. 2, 4).
Step 3. connect the power cord and  wire safely(figure 3).
Step 4. Fit the tube into the lamp holder, and rotate tubes to horizontal level. Hang up the lamp with insurance rope solidly, ensure the plate edge's buckle  recessed into reflector hole totally (figure 4), or put the springs into spring seat, cover the film, grille net (figure 5), power on and  use.
Notes
▼1. indoor light, nonwater-pfoof, forbit using it in outdoor, dry, high temperature, totally closed or combustible and explosive place.
▼2. Stock it in cool ,dry and spotless place.
▼3. Must make sure the input voltage conforming to marked voltage, otherwise the tube maybe destroyed.
▼4. it couldnot be dimmable, donnot match dimmer.