Disassemble the LED tubes for Cree and Philips compatible electronic ballasts
Currently, most LED fluorescent tubes require rewiring to eliminate ballasts during installation. This "rewiring" undoubtedly adds another labor cost to the user, especially in the North American market, and requires the operator to have an electrician certificate and purchase social security. In order to save this labor cost, there is a lamp that is compatible with the electronic ballast LED.
Figure: Schematic diagram of lamp installation for electronic ballast LEDs that are very convenient to operate
According to Philips estimates, today's global installation of traditional fluorescent tube lighting reaches 12 billion (lights). Traditional fluorescent tubes and instant-on electronic ballasts are one of the most common types of general lighting used in shops, offices and industrial locations. Now, let 's take a look at the compatible electronic ballast LED T8 tubes that are currently selling the two best brands in the North American market (Philips and CREE ).
Sample display
Picture: CREE T8
Photo: Philips T8
test sample
The following data was tested using a Phillips Cantium ICN-2P32-N electronic ballast.
PS: FCC compatibility and temperature rise testing can be found in the in-depth evaluation version.
Comments:
LED lamps compatible with electronic ballasts, when connected to different electronic ballasts, power and luminous flux are not the same. The following is a screenshot from the product specification:
Figure: CREE LED T8 product specification screenshot
CREE's LED T8 tube-compatible electronic ballasts are available in 19 brands and 40 models.
Figure: Screenshot of the Philips LED T8 product specification
Philips' LED T8 tube-compatible electronic ballasts are available in 5 brands and 74 models.
CREE article for sample disassembly
A. Structure
Design highlights: The new generation of CREE lamps, the shape and size of the plugs are consistent with the traditional lamps, except for the conventional design of the conventional shape of the LED tubes , the entire tube is monolithic and integrally extruded. The material used is rigid and the 1.2M lamp has no obvious deformation/bending.
Design highlights: a new generation of CREE lamps, with a full plastic tube design, and the plug assembly is designed with three snaps instead of conventional screws, which saves man-hours, reasonable structural design, proper buckle pressure, and requires tools and Destruction can be dismantled.
Design highlights: The new generation of CREE lamps, with a shrapnel-contact conductive design, instead of conventional plug-in terminals or wire bonds, are very easy to automate and save time.
â–²Warning: This design has fatal flaws, please see below.
B. Light source part
Design highlights: a new generation of CREE lamps, 80pcs Cree 3030 lamp beads, CAM1 semi-glass fiberboard for the substrate, this design is very bold, fully proof that CREE has great confidence in the control of the heat of their own light source.
C. Power section
Design highlights: CREE's new generation of lamps use a highly integrated design concept that is divided into two ends of the AB. This scheme is a RC linear buck solution. The power circuit is simple, the power supply and the lamp board are integrated into a low cost, and it is easy to produce; the power supply can only work normally under the electronic ballast drive.
Comments:
1. CREE's previous generation of lamps is made of aluminum profile + PC. The new generation of CREE T8 lamps adopts all-plastic tube design and simple structural design. The cost is obviously reduced, and the whole product is more competitive in the market.
2. In the design of the structure, if the contact between the spring contact and the printed circuit board (PCB) is insufficient, the resistance will form an arc excessively, causing overheating, which may cause the lamp to melt, posing a fire and burn hazard.
CREE announced on the official website that the 700,000 all recalls were produced from 2014 / 8 / 20 to 2015 / 4 / 30.
Sample dismantling of the Philips article
A. Structure
Design highlights: Philips lamps still follow the conventional design of LED tubes, retaining the design of long plugs, the connection between the plug and the lamp body is 1 screw, locked by the plastic plug on the aluminum profile, inside the plug Positioning design to ensure the positioning of the screw.
Design highlights: Philips lamps use a hollow rivet with a pin-in combination to directly insert the plug. Thanks to the design of the guide position, the assembly efficiency is very high.
Design highlights: Philips lamp structure can be seen, Philips is not only very particular about the materials, but also very conservative in the entire design, interlocking use of a dual protection design.
B. Light source part
Design highlights: use 60pcs Philips 3030 lamp bead, the substrate is made of fiberglass board, and the reflective paper is attached to it, which effectively improves the light extraction rate and uniformity of light output. The bottom of the substrate is supported by aluminum profile to ensure structural stability and heat dissipation. The use of two pieces of solder after splicing, the significance of this move is different for the reasons of the machine and the venue, the cost is a matter of opinion.
C. Power section
Design highlights: divided into two ends of AB. This scheme is a RC linear buck scheme with simple circuit and low cost; the power supply can only work normally under the electronic ballast drive.
Comments:
1. Philips The new generation of lamps, like the previous generation of lamps, also uses a full plastic tube, but the lengthening of the plug reduces the dark spots at both ends. The LED sinks to the bottom, using fewer LED beads than the previous generation. The cost of LEDs is large in the tube, the number of LEDs is used less, and the cost is significantly reduced.
2. The power supply is a conventional high-frequency RC-capacitor circuit. The power supply step-down consists of a capacitor and a diode resistor. The control circuit consists of an IC (this IC is packaged with two triodes) and a peripheral circuit. It is connected to an external current path. Form a simple control circuit.
Power supply disadvantage: Constant current accuracy is poor.
Cost-effective analysis
Philips' LED T8 tube is priced at $24.97 on The Home Depot, the largest home building retailer in North America.
Figure: Philips LED T8 lamp price screenshot
Cree's lamp retail price in North America is $22.38. Due to product quality, most retailers have been removed from the market.
risk warning
When the two lamps are tested, the system efficiency change is changed when 1 drag 1 and 1 drag 2 are implemented on the same ballast, and the ballast is operated with 1 drag 1 (with half load). It is easy to damage the ballast. At the same time, the difference in current output is large, which also affects the life of the LED.
in conclusion
Design / rating
Packing: All are in color box, because CREE highlights the selling point of CRI90, the color box design is very bright.
Rating: CREE: ☆ ☆ ☆ ☆ ☆, Philips: ☆ ☆ ☆ ☆
Appearance: Both lamps are designed with a full plastic tube. In the design of the plug, Philips added a blue circle design to make the whole tube more layered.
Rating: CREE: ☆☆☆, Philips: ☆☆☆☆
Structure: Structural design CREE's lamp is more compact and can meet the requirements of automated production (although the product is recalled, this defect can be avoided).
Rating: CREE: ☆ ☆ ☆ ☆ ☆, Philips: ☆ ☆ ☆ ☆
LED: All use their own 3030. The two LED lights are all first-line brands, and their quality has not been said. CREE is CRI90 and Philips is CRI80. CREE uses 20PCS more than Philips. The selling point of CRI90 is more prominent, of course, the cost is also more than 1~1.5 dollars.
Rating: CREE: ☆ ☆ ☆ ☆ ☆, Philips: ☆ ☆ ☆ ☆
Power: Both power supplies use a RC linear buck solution. CREE's power supply step-down consists of a capacitor and a diode resistor inductor. It is a simple resistor-capacitor step-down circuit. Philips' power supply buck consists of a capacitor and a diode resistor. The control circuit consists of an IC (this IC is packaged with two triodes) and a peripheral circuit that forms a simple control circuit with the external current path. From the design and test results of the power supply, Philips' power solution is better than CREE.
Rating: CREE: ☆☆, Philips: ☆☆☆
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