# How many watts is a led tube 90 cm long?

Update:21 Oct 2020
Summary:

The use of 90 cm long led tube To know how many watts t […]

The use of 90 cm long led tube

To know how many watts the 90 cm long LED tube is, we must first understand the purpose of the 90 cm long LED tube. The 90-minute long LED tube has the same length as the 90 cm long ordinary fluorescent tube. It is usually used for convenience. Replace ordinary inductive 90 cm fluorescent lamps.

90 cm long led tube usually replaces 30W90 cm ordinary fluorescent tube

The power of a 90 cm long ordinary inductive fluorescent lamp is usually 30W, and the luminous flux of a finished fluorescent lamp with a 90 cm ordinary inductive fluorescent lamp is usually 33*30W=990lm. With the same brightness, the replacement LED tube 90 cm long only needs to meet the requirement of 990lm luminous flux.

The upper limit power of 90 cm long led tube is usually 16W

At present, the common practice in the industry is to use 72 0.2W 2835 lamp beads to produce. If the power of these 72 0.2W 2835 lamp beads is used up, it is 72*0.2=14.4. If the driving efficiency of the LED fluorescent lamp is calculated as 0.9 (in the industry, under normal circumstances, the driving efficiency of ordinary low power factor is 0.92- 0.94, high power factor is usually between 0.88-0.9), the whole lamp power is 14.4/0.9=16W, this power 16W is usually the upper limit of the power of 90 cm LED fluorescent lamp management theory, under normal circumstances it cannot exceed this If there is a requirement to increase power in special occasions, the number of lamp beads must be increased, and the thickness and heat dissipation area of ​​the aluminum kit must be increased to enhance heat dissipation.

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