diff --git a/esphome/components/spi_led_strip/light.py b/esphome/components/spi_led_strip/light.py
index 78642935de..ca320265a9 100644
--- a/esphome/components/spi_led_strip/light.py
+++ b/esphome/components/spi_led_strip/light.py
@@ -1,8 +1,7 @@
 import esphome.codegen as cg
+from esphome.components import light, spi
 import esphome.config_validation as cv
-from esphome.components import light
-from esphome.components import spi
-from esphome.const import CONF_OUTPUT_ID, CONF_NUM_LEDS
+from esphome.const import CONF_NUM_LEDS, CONF_OUTPUT_ID
 
 spi_led_strip_ns = cg.esphome_ns.namespace("spi_led_strip")
 SpiLedStrip = spi_led_strip_ns.class_(
@@ -18,8 +17,7 @@ CONFIG_SCHEMA = light.ADDRESSABLE_LIGHT_SCHEMA.extend(
 
 
 async def to_code(config):
-    var = cg.new_Pvariable(config[CONF_OUTPUT_ID])
-    cg.add(var.set_num_leds(config[CONF_NUM_LEDS]))
+    var = cg.new_Pvariable(config[CONF_OUTPUT_ID], config[CONF_NUM_LEDS])
     await light.register_light(var, config)
     await spi.register_spi_device(var, config)
     await cg.register_component(var, config)
diff --git a/esphome/components/spi_led_strip/spi_led_strip.cpp b/esphome/components/spi_led_strip/spi_led_strip.cpp
new file mode 100644
index 0000000000..46243c0686
--- /dev/null
+++ b/esphome/components/spi_led_strip/spi_led_strip.cpp
@@ -0,0 +1,67 @@
+#include "spi_led_strip.h"
+
+namespace esphome {
+namespace spi_led_strip {
+
+SpiLedStrip::SpiLedStrip(uint16_t num_leds) {
+  this->num_leds_ = num_leds;
+  ExternalRAMAllocator<uint8_t> allocator(ExternalRAMAllocator<uint8_t>::ALLOW_FAILURE);
+  this->buffer_size_ = num_leds * 4 + 8;
+  this->buf_ = allocator.allocate(this->buffer_size_);
+  if (this->buf_ == nullptr) {
+    ESP_LOGE(TAG, "Failed to allocate buffer of size %u", this->buffer_size_);
+    return;
+  }
+
+  this->effect_data_ = allocator.allocate(num_leds);
+  if (this->effect_data_ == nullptr) {
+    ESP_LOGE(TAG, "Failed to allocate effect data of size %u", num_leds);
+    return;
+  }
+  memset(this->buf_, 0xFF, this->buffer_size_);
+  memset(this->buf_, 0, 4);
+}
+void SpiLedStrip::setup() {
+  if (this->effect_data_ == nullptr || this->buf_ == nullptr) {
+    this->mark_failed();
+    return;
+  }
+  this->spi_setup();
+}
+light::LightTraits SpiLedStrip::get_traits() {
+  auto traits = light::LightTraits();
+  traits.set_supported_color_modes({light::ColorMode::RGB});
+  return traits;
+}
+void SpiLedStrip::dump_config() {
+  esph_log_config(TAG, "SPI LED Strip:");
+  esph_log_config(TAG, "  LEDs: %d", this->num_leds_);
+  if (this->data_rate_ >= spi::DATA_RATE_1MHZ) {
+    esph_log_config(TAG, "  Data rate: %uMHz", (unsigned) (this->data_rate_ / 1000000));
+  } else {
+    esph_log_config(TAG, "  Data rate: %ukHz", (unsigned) (this->data_rate_ / 1000));
+  }
+}
+void SpiLedStrip::write_state(light::LightState *state) {
+  if (this->is_failed())
+    return;
+  if (ESPHOME_LOG_LEVEL >= ESPHOME_LOG_LEVEL_VERBOSE) {
+    char strbuf[49];
+    size_t len = std::min(this->buffer_size_, (size_t) (sizeof(strbuf) - 1) / 3);
+    memset(strbuf, 0, sizeof(strbuf));
+    for (size_t i = 0; i != len; i++) {
+      sprintf(strbuf + i * 3, "%02X ", this->buf_[i]);
+    }
+    esph_log_v(TAG, "write_state: buf = %s", strbuf);
+  }
+  this->enable();
+  this->write_array(this->buf_, this->buffer_size_);
+  this->disable();
+}
+light::ESPColorView SpiLedStrip::get_view_internal(int32_t index) const {
+  size_t pos = index * 4 + 5;
+  return {this->buf_ + pos + 2,       this->buf_ + pos + 1, this->buf_ + pos + 0, nullptr,
+          this->effect_data_ + index, &this->correction_};
+}
+}  // namespace spi_led_strip
+}  // namespace esphome
diff --git a/esphome/components/spi_led_strip/spi_led_strip.h b/esphome/components/spi_led_strip/spi_led_strip.h
index 1b317cdd69..14c5627ac3 100644
--- a/esphome/components/spi_led_strip/spi_led_strip.h
+++ b/esphome/components/spi_led_strip/spi_led_strip.h
@@ -13,74 +13,22 @@ class SpiLedStrip : public light::AddressableLight,
                     public spi::SPIDevice<spi::BIT_ORDER_MSB_FIRST, spi::CLOCK_POLARITY_HIGH, spi::CLOCK_PHASE_TRAILING,
                                           spi::DATA_RATE_1MHZ> {
  public:
-  void setup() override { this->spi_setup(); }
+  SpiLedStrip(uint16_t num_leds);
+  void setup() override;
+  float get_setup_priority() const override { return setup_priority::IO; }
 
   int32_t size() const override { return this->num_leds_; }
 
-  light::LightTraits get_traits() override {
-    auto traits = light::LightTraits();
-    traits.set_supported_color_modes({light::ColorMode::RGB});
-    return traits;
-  }
-  void set_num_leds(uint16_t num_leds) {
-    this->num_leds_ = num_leds;
-    ExternalRAMAllocator<uint8_t> allocator(ExternalRAMAllocator<uint8_t>::ALLOW_FAILURE);
-    this->buffer_size_ = num_leds * 4 + 8;
-    this->buf_ = allocator.allocate(this->buffer_size_);
-    if (this->buf_ == nullptr) {
-      esph_log_e(TAG, "Failed to allocate buffer of size %u", this->buffer_size_);
-      this->mark_failed();
-      return;
-    }
+  light::LightTraits get_traits() override;
 
-    this->effect_data_ = allocator.allocate(num_leds);
-    if (this->effect_data_ == nullptr) {
-      esph_log_e(TAG, "Failed to allocate effect data of size %u", num_leds);
-      this->mark_failed();
-      return;
-    }
-    memset(this->buf_, 0xFF, this->buffer_size_);
-    memset(this->buf_, 0, 4);
-  }
+  void dump_config() override;
 
-  void dump_config() override {
-    esph_log_config(TAG, "SPI LED Strip:");
-    esph_log_config(TAG, "  LEDs: %d", this->num_leds_);
-    if (this->data_rate_ >= spi::DATA_RATE_1MHZ) {
-      esph_log_config(TAG, "  Data rate: %uMHz", (unsigned) (this->data_rate_ / 1000000));
-    } else {
-      esph_log_config(TAG, "  Data rate: %ukHz", (unsigned) (this->data_rate_ / 1000));
-    }
-  }
+  void write_state(light::LightState *state) override;
 
-  void write_state(light::LightState *state) override {
-    if (this->is_failed())
-      return;
-    if (ESPHOME_LOG_LEVEL >= ESPHOME_LOG_LEVEL_VERBOSE) {
-      char strbuf[49];
-      size_t len = std::min(this->buffer_size_, (size_t) (sizeof(strbuf) - 1) / 3);
-      memset(strbuf, 0, sizeof(strbuf));
-      for (size_t i = 0; i != len; i++) {
-        sprintf(strbuf + i * 3, "%02X ", this->buf_[i]);
-      }
-      esph_log_v(TAG, "write_state: buf = %s", strbuf);
-    }
-    this->enable();
-    this->write_array(this->buf_, this->buffer_size_);
-    this->disable();
-  }
-
-  void clear_effect_data() override {
-    for (int i = 0; i < this->size(); i++)
-      this->effect_data_[i] = 0;
-  }
+  void clear_effect_data() override { memset(this->effect_data_, 0, this->num_leds_ * sizeof(this->effect_data_[0])); }
 
  protected:
-  light::ESPColorView get_view_internal(int32_t index) const override {
-    size_t pos = index * 4 + 5;
-    return {this->buf_ + pos + 2,       this->buf_ + pos + 1, this->buf_ + pos + 0, nullptr,
-            this->effect_data_ + index, &this->correction_};
-  }
+  light::ESPColorView get_view_internal(int32_t index) const override;
 
   size_t buffer_size_{};
   uint8_t *effect_data_{nullptr};