1. 10–15W (E-180) — Pin Types

These small lamps almost always use:

✅ 2-Pin (G5)

• Two pins on one side

• Thin lamp

• Common in domestic RO UV systems

• Transformer E-180 is matched for this

What it looks like:
• O O (two straight pins)

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🔌 2. 25–28W (E-360) — Pin Types

These lamps usually use:

✅ 4-Pin Inline (G10Q)

• Four pins in a straight row

• Fits many domestic UV housings

Looks like:
• O O O O

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🔌 3. 30–35W (E-480) — Pin Types

Common pins:

✅ 4-Pin Inline (G10Q)

or

✅ 4-Pin Square (2G11)

Inline: O O O O
Square:
O O
O O

The transformer must match the lamp type (inline or square).

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🔌 4. 40–55W (E-720) — Pin Types

Most 40W–55W lamps use:

✅ 4-Pin Square (2G11)

• Very common in 55W UVs (SDE-055)

Looks like:
O O
O O

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🔌 5. 65W (E-800) — Pin Types

Big commercial UV lamps use:

✅ 4-Pin Square (2G11)

or

✅ 4-Pin Industrial High-Output

Most 65W + UV use longer square-pin lamps.

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⭐ HOW TO KNOW THE PIN TYPE ON YOUR UV LAMP

Look at the lamp end:

✔ Count the pins

2-pin → small systems
4-pin → medium to large systems

✔ Check the layout

Straight line → G10Q
Square shape → 2G11

✔ Check the transformer connector

Most transformers have the matching plug.